Polysulfuration
聚硫化作用
🗣️ 情景例句
I don't know why I didn't think of it.
我不知道为什么我没有想到这一点。
I'm a fast thief.
我是个跑得快的小偷。
Good morning. I am. Everyone is here. No one is away.
早上好。我值日。大家都来了。没有人缺席。