Polyurea
[化] 聚脲
🗣️ 情景例句
I didn't mean to do that.
我并不想要那么做。
I have to hang up now.
我现在不得不挂电话了。
How did the bees know exactly in which diection to fly?
蜜蜂是怎样确切地知道朝哪个方向飞呢？