?? 詞語組成解析
龍膽屬
??? 情景例句
This house just came on the market.
這棟房子剛剛推出要賣。
To drive a delivery car
駕駛送貨車
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。