Ear-drum
[医]（耳）鼓膜, 鼓室
📖 牛津释义
ear-drum
(also drum) n thin membrane in the inner part of the ear which vibrates when sound waves strike it 鼓膜. =>illus 见插图.
🧩 词语组成解析
ear
[iə]
n. 耳朵;听觉，听力;耳状物;穗;
vi. 抽穗;（美俚）听见;
drum
[drʌm]
n. 鼓;鼓状物;鼓声;石首鱼;
vt. 击鼓;连打;反复讲;鼓吹;
vi. 击鼓;连打;拍翅;
🗣️ 情景例句
That is fantastic, John!
那太好了， John。
Where your will is ready, your feet are light.
下定了决心，脚步就轻盈。决心一下，脚下生风？
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。