Comprex
气波增压器
🗣️ 情景例句
And my phone number is 797-7963.
我的电话是797-7963。
Do you have some envelopes?
你有信封吗？
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。