Fyrite
富赖特二氧化碳测定仪
🗣️ 情景例句
Thanksgiving was about the Pilgrims,
感恩节是关于清教徒的，
Where will you be nest year at this time?
明年这个时候你将在哪里？
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。