Backdown
n. 收回原来的声明[观点]
✅ 同义词
🗣️ 情景例句
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He who is ashamed of asking is ashamed of learning.
耻于问者耻于学。
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。