1·Answer: Blow a paint film with keen penknife, if not disintegrate, do not stick in case, can furl naturally, think flexibility is good namely.
答：用锐利的小刀刮下一块漆膜，若不碎裂、不粘在起，能自然卷起，即认为弹性良好。
1·Adopting the structure, the contractile thread can be used to furl the waste plastic bottle. The top of the bottle is sleeved with the bottom of the other to save the space.
由于采用上述结构，所以利用可收缩的螺纹将废弃的塑料瓶收拢，一个瓶的顶部与另一个瓶的底部相套在一起，达到节约空间的目的。