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A thermally insulating member includes a plane sheet having two ends spaced in a length direction and two sides spaced in a thickness direction perpendicular to the length direction. The plane sheet includes a plurality of rows of slits between the ends of the plane sheet. Each row of slits extends

A thermally insulating member includes a plane sheet having two ends spaced in a length direction and two sides spaced in a thickness direction perpendicular to the length direction. The plane sheet includes a plurality of rows of slits between the ends of the plane sheet. Each row of slits extends from one of the sides through the other side of the plane sheet. A first spacing between two adjacent rows of slits in the length direction is larger than a spacing between two adjacent slits in the same row of slits in a width direction perpendicular to the length and width directions by a second spacing. A thermally insulating strip is defined between two adjacent rows of slits. A stretchable rib is formed between two adjacent slits in the same row of slits. Each end of the plane sheet is a coupling portion free of the slits.

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1. A thermally insulating member comprising a plane sheet including a sheet, wherein the sheet includes a first direction and a second direction perpendicular to each other, wherein the sheet is able to form a cyclic structure encircling the second direction, wherein the sheet includes a plurality o

1. A thermally insulating member comprising a plane sheet including a sheet, wherein the sheet includes a first direction and a second direction perpendicular to each other, wherein the sheet is able to form a cyclic structure encircling the second direction, wherein the sheet includes a plurality of broken lines extending along a second direction, wherein two adjacent broken lines are spaced from each other in the first direction, wherein each broken line includes a plurality of slits, wherein two adjacent slits are spaced from each other in the second direction, wherein each slit has a first section aligned with the second direction, wherein each of two opposing ends of the first section respectively connects a second section, wherein the two second sections extend at an angle to the first section towards a same side of the sheet in the first direction, and wherein the sheet is able to be stretched in a first direction to form a wavy sheet with at least some of the plurality of slits forming heat dissipating holes. 2. The thermally insulating member as claimed in claim 1, wherein the plurality of slits of two adjacent broken lines is arranged in a staggered manner in the first direction. 3. The thermally insulating member as claimed in claim 2, wherein the plurality of slits of two adjacent broken lines is arranged in an overlapping staggered manner in the first direction, wherein a slit of one of the broken lines overlaps with another slit of the other broken line in the first direction, and wherein the two slits are located in different positions in the second direction. 4. The thermally insulating member as claimed in claim 1, wherein a thermally insulating strip is defined between two adjacent broken lines, wherein each thermally insulating strip has two ends spaced from each other in the second direction, and wherein each end of the thermally insulating strip has at least one rounded corner. 5. The thermally insulating member as claimed in claim 1, wherein the sheet has two peripheries spaced from each other in the second direction, wherein the slits communicating with one of the peripheries have a first length, wherein the slits communicating with the other periphery have a second length, and wherein the first length is longer than the second length. 6. The thermally insulating member as claimed in claim 1, wherein the sheet has two sides spaced from each other in the first direction, wherein each side of the sheet has a coupling portion, wherein the plurality of broken lines is arranged between the two coupling portions, and wherein the two coupling portions are able to couple with each other. 7. The thermally insulating member as claimed in claim 6, wherein the sheet has a separation portion located between the two coupling portions, and wherein the plurality of broken lines is arranged between the separation portion and each of the coupling portions. 8. The thermally insulating member as claimed in claim 1, wherein two adjacent broken lines are spaced from each other in the first direction by a spacing, the spacings of every two adjacent broken lines are even. 9. The thermally insulating member as claimed in claim 6, wherein two adjacent broken lines are spaced from each other in the first direction by a spacing, wherein the sheet has an axis parallel to the second direction, and wherein the spacings of every two adjacent broken lines decrease or increase from the axis towards the two coupling portions. 10. The thermally insulating member as claimed in claim 6, wherein one of the coupling portions is applied with an adhesive, and wherein the other coupling portion is bonded to the coupling portion with the adhesive to form the sheet in the cyclic structure. 11. The thermally insulating member as claimed in claim 6, wherein a coupling mechanism is formed on the two coupling portions, and wherein the coupling mechanism includes a coupling member in one of the coupling portions and a coupling hole on the other coupling portion. 12. The thermally insulating member as claimed in claim 1, wherein the sheet means for being mounted around a container, wherein the cyclic structure has a first state and a second state, wherein the cyclic structure has a first circumference in the first state, wherein the first circumference is smaller than a circumference of the outer surface of the container, wherein the cyclic structure has a second circumference in the second state, wherein the second circumference is equal to the circumference of the outer surface of the container, and wherein the sheet is stretched outward by the container to transform the cyclic structure from the first state into the second state. 13. The thermally insulating member as claimed in claim 12, wherein a thermally insulating strip is defined between two adjacent broken lines, wherein each of the junctions between the thermally insulating strips and the plurality of slits of the broken lines forms a rib, wherein a distance is formed between each rib and the outer surface of the container, and wherein each of the portions of the insulating strips connected to the spacing portions between the plurality of slits forms a stretchable rib. 14. The thermally insulating member as claimed in claim 13, wherein for two thermally insulating strips adjacent to each other, a rib of one of the thermally insulating strips is align with a stretchable rib of the other thermally insulating strip in the first direction, wherein a substantially rhombic heat dissipating hole is defined between rib and the stretchable rib, and wherein the heat dissipating hole penetrates through the sheet and communicates with the outer surface of the container. 15. The thermally insulating member as claimed in claim 12, wherein a thermally insulating strip is defined between two adjacent broken lines, wherein each of the second sections provides a guiding force to bend the adjacent thermally insulating strip and form a fold line on the sheet.