Picknometer,pycnometer
[化] 比重瓶; 比重管
🗣️ 情景例句
So that's it.
原来是这件事。
Are you required to fill a quota of work each month?
你被要求每月都要达成工作的目标吗？
He began his diet a week ago.
他是一星期前开始节食的。