Picknometer,pycnometer
[化] 比重瓶; 比重管
??? 情景例句
He has no capacity to be a doctor.
他沒有當醫生的能力。
If things were to be done twice all would be wise.
事事倘能做兩次，人人都可稱明智。
No. I've never been to that farm before. What kinds of animals have they got?
不，我以前從來沒有去過那個農場。他們有哪些種類的動物？