Polybutadiene
[机] 聚丁二烯
🗣️ 情景例句
We haven't had any complaint of this kind. Is there any evidence.
我们还从未听过这样的抱怨。有什么证据呢？
If there's anything else I can do , please tell me.
如果有任何事情我能效劳的话，请告诉我。
So where's your bike today?
那么今天您的自行车在哪里呢？