Acquiescing
vi. 默許；勉強同意
??? 情景例句
I'm Richard. What's your name?
我是Richard！你叫什么？
Many a little makes a mickle.
積少便成多。
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.
我們只要看一看蝙蝠回聲定位這一極不尋常的發現，就可以探究一下聲音在什么情況下有絕對的實用價值。