Picknometer,pycnometer
[化] 比重瓶; 比重管
🗣️ 情景例句
If you want a job in journalism, you'll need to undertake media studies.
如果你想在新闻界工作，你得学习媒体知识。
A mean boy teases the dog.
一个淘气的男孩在捉弄着狗。
and often are foolish enough to let the adolescents see that they are annoyed.
而且愚蠢地让孩子看出自己的烦恼。