塑料适当加热就可以软化。

Plastics will soften when exposed to heat.

磁盘套子装软磁碟片的塑料套或纸板套

The plastic or cardboard container that holds a floppy disk.

增塑剂加入塑料或其它材料中使其柔软或易弯或保持其柔软或易弯性的各种物质之一

Any of various substances added to plastics or other materials to make or keep them soft or pliable.