Elatrometer
[化] 气体密度计
🗣️ 情景例句
It's midnight.
都午夜了。
How long have you been studying English?
你学了多长时间的英语了？
I know that he's doing his best, but he says that he is a little weak in Chinese.
我知道他非常努力，但他说他的中文有点儿差。