Alackaday
int. 呜呼, 哀哉
🗣️ 情景例句
on the school board,
在联合校董会中
There is a small choice in rotten apples.
朽木不可雕。
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。