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。
新概念英语第四册 Lesson 7 Bats

📚 句中词汇解析

从本句中提取的重要词汇

interval ['ɪntɚvl] 词频2 词根: inter
n. 间隔;幕间休息;（数学）区间;
💡 inter(between)+val(wall)→间隔；距离；差异
"The interval between major earthquakes might be 200 years."
大地震之间的间隔时间可能有200年。
近义：interlude, intermission, lapse, pause, recess, span
receipt [rɪ'sit] 词频2 词根: re
n. 收据，发票;收入; vt. 开收据;[美国英语]给…开收据，承认收到;
💡 re一再，重新+ceipt收→收据
"We are in receipt of your letter of the 10 th."
我们收到了您十日的来函.
近义：voucher, bill, chit
depth [dɛpθ] 词频2 词根: th
n. 深度;深处，深海;深奥，奥妙;进深;
💡 dep=deep深的+th抽象名词 →深度
"What's the depth of the water here?"
这儿的水有多深？
近义：profundity, deepness, inwardness, profoundness
point [pɔɪnt] 词频1 词根: 刺扎
n. 点;要点;得分;标点; vt. （意思上）指向;削尖;加标点于;指路; vi. 表明;指向;
💡 point(prick)→点；地点；目的；时刻；使锐利；指示
"Racial tension has reached boiling point ."
种族间的紧张状态已达到一触即发的程度。
近义：range, aim, hone, sharpen, strap, strop
time [taɪm] 词频1
n. 时间;时刻;时代;次; vt. 为…安排时间;测定…的时间;调准（机械的）速度;拨准（钟、表）的快慢; vi. 合拍;和谐;打拍子; adj. 定时的;定期的;[美国英语]分期（付款）的; int. [体育]时间到，（一场或一局等的）比赛时限，暂停;
"I can only carry two at a time."
我一次只能带两个。
近义：clock, lifetime, period, season, chapter, aeon

📚 更多「新概念英语第四册」例句

Stone does not decay,
石头是不会腐烂的。
There were hopes, however, that the problem of the rabbit would become manageable.
但是，已有希望解决兔子所带来的问题。
This knocks the turtle down several feet.
这一下子把海龟撞下去好几英尺。
But even in the most favourable circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them.
即使是在最有利的环境中，死去的生物中也只有一小部分能在开始腐烂前，或更可能在被食腐动物吃掉之前，被这样保存下来。
however good and adequate they may be both as parents and as individuals,
不管家长的人品有多么好，作为父母又多么合格，
Once waves have been generated,
一旦波浪形成，