Areopyknometer
[机] 比重瓶比重计
🗣️ 情景例句
I'd like to give thanks for a healthy year, a good job,
我感谢这一年来身体健康 工作顺利，
He is playing on the see-saw in the yard.
他正在院子里玩跷跷板。
In the back row.
教室后排。