Straitens
vt. 限制；使…穷困；使…为难\\nvi. 变窄；变紧
🗣️ 情景例句
I'm supposed to be worried about my daughter,
我原该为我的女儿担心才是。
Joy put heart into a man.
人逢喜事精神爽。
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。