决定了日更，纯英文输出/英语句子解析/翻译练习/分享英语相关类美文，每日于四者之中择其一、二为功课，恪行之。
①美文共欣赏：如何自主高效学习英文口语？https://www.zhihu.com/answer/897387383
②长难句解析
The depth of the sea at that point can be calculated by measuring the time interval between the taps and the return of the echoes.通过测量敲打和回声之间的时间间隔可以计算出该处海洋的深度。
句子主干：The depth can be calculated【深度可以被计算出】
划分句子成分：The depth 〖of the sea／海洋的 ，介词短语做定语，修饰“The depth”〗〖at that point ／该处，介词短语做定语，修饰“sea”〗can be calculated〖 by measuring the time interval／通过测量时间间隔，介词短语做“calculated”的后置状语 〗〖between the taps and the return of the echoes／敲打和回声之间，介词短语做后置定语，修饰“the time interval”〗
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