Pentalkylated
五烃基代的
🗣️ 情景例句
I know. I know. I'm really sorry.
我知道 我知道。真的很抱歉。
A little child is the sweetest and purest thing in the world.
幼儿是世界上最可爱和最纯洁的。
I'm afraid some people forgot to sweep the floor.
它不如平时干净，恐怕是一些人忘记扫地了。