Plastacele
粉状醋酸纤维素
🗣️ 情景例句
and I have a production meeting at four.
我四点钟有个生产会议。
Seeing is believing.
眼见为实。
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
测出回声间隔的时间，便可算出该处海洋的深度。