Travertin
n. [地]石灰华,钙华(建筑用)
🗣️ 情景例句
The best man always keeps the rings.
男傧相总是保管戒指的。
He made an important contribution to the company's success.
他对公司的成功做出了重要的贡献。
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。