Marahuite
土状沥青褐煤, 藻烛煤
🗣️ 情景例句
Thanks a lot. Bye.
多谢，再见。
As you sow you shall mow.
种瓜得瓜，种豆得豆。
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。