Polysulfuration
聚硫化作用
🗣️ 情景例句
You work hard on all your committees,
而你总是在各种委员会里忙，
The little car has lots of room.
这小汽车有许多空间。
When the dentist at last removed the cotton wool from my mouth,
当那位牙医最后将药棉从我嘴中取出时，