🧩 词语组成解析
民谣, 抒情曲
🗣️ 情景例句
Is something wrong, Alexandra?
怎么了Alexandra？
To watch the accident
观察意外事故的现场
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。