Plummier
a. 李子似的；好的；有利的；多葡萄干的 (plummy的变形)
🗣️ 情景例句
It's good to meet you.
很高兴见到 。
I deeply regret my thoughtlessness.
我深为反省自己的轻率。
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。