Picknometer,pycnometer
[化] 比重瓶; 比重管
🗣️ 情景例句
I retired because... I wanted to be with my family.
我退休是因为……我想和全家人在一起。
The postman always comes at 2 o'clock.
邮递员总是在2点钟来。
I said that together we could light a fire that could be seen for many miles.
我说，我们一起点燃一堆火，让几英里远都能看见。