Definite ducts
[医] 直乳管
🧩 词语组成解析
n. 通风管道；管道（duct的复数）
🗣️ 情景例句
Friends, teachers....
朋友 老师……
I'm not myself today.
我今天心神不安。
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。