Picknometer,pycnometer
[化] 比重瓶; 比重管
🗣️ 情景例句
We've always lived in this area.
我们一直住在这个地区。
Oaks may fall when reeds stand the storm.
树大招风。
Some of them were as big as marbles.
有的钻石像玻璃球那么大。