Alkylammonium
烷基铵
🗣️ 情景例句
Yup. I graduated in 1937.
是的，我是一九三七年毕业的。
Would you please hold the door open for me?
可以请你为我把门拉着吗？
In five working days, if we ship by air.
如果空运的话，五个工作天内可以到。