在普通袜子1的脚跟部贴有一层不透空气的胶膜2。
A layer of airtight film adhesive 2 is adhered at the heel part of ordinary socks 1.
通过丁烯和异戊二烯的共聚作用化合而成的一种合成橡胶，几乎不透空气，用作轮胎、内管道和绝缘等的材料中。
A synthetic rubber produced by copolymerization of a butylene with isoprene, nearly impermeable to air and used in tires, inner tubes, and insulation.
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