Photosedimentometer
光透式粒度测定仪
🗣️ 情景例句
Good. Do you have any back or knee problems?
好。你的背部和膝关节有什么毛病吗
I have a good-paying job with excellent hours.
我有一个有极好工作时间和好报酬的工作。
Who is he?
他是谁？