Valuableness
n. 昂贵, 贵重
🗣️ 情景例句
He worked his way through college.
他半工半读念完大学。
How much is the postage for this?
这个邮费要多少钱？
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。