Areo-pyknometer
[医] 小量液比重瓶
🧩 词语组成解析
[医] 比重瓶
🗣️ 情景例句
Aren't you going to the aerobics class this morning?
今天上午你不是去上有氧运动课吗？
To drop
掉下
How often do you write?
你们隔多久写信？