Apell
[医][=Assessment Program of Early Learning Levels]早期学习水平的评价程序
🗣️ 情景例句
What's the capital city of France?
法国的首都是哪里？
To play hopscotch
玩跳房子
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。