Polybutadienes
(polybutadiene 的复数) [机] 聚丁二烯
🗣️ 情景例句
Good. Then you'll be here about five?
很好。那么 大约在五点左右来。
I'm not well enough.
我还不够棒。
Would you do me a favor?
你能帮我一个忙吗？