Photosedimentometer
光透式粒度测定仪
🗣️ 情景例句
I want you to hear my new tapes.
我给你听我的新录音带。
Please sign.
请你签字。
Sure enough, a policeman arrived on the scene and politely asked the workmen to go away.
果然，警察来了，不礼貌地请工人离开此地；