Photosedimentometer
光透式粒度测定仪
🗣️ 情景例句
I came home a little while ago.
我也是刚刚到家。
The United Nations conference is projected for next year.
联合国大会预定明年召开。
They saw many old things on show in glass-topped tables.
他们看到了在带玻璃罩的桌子里展出的许多古老的东西。