Radula
n. 齿舌
🗣️ 情景例句
I'm going to play with a group of friends.
我打算和朋友一起玩。
The only secret a woman can keep is that of her age.
女人能保守的唯一秘密是她的年龄。
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。