Sera
浆液, 血清\\n[医] 血清; 浆液
🗣️ 情景例句
The economy is booming in this country.
这个国家的经济形势一片大好。
You may rest assured that the shipment will be duly delivered.
你们尽可放心，我们会按时交货的。
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。