Peritron
荧光屏可轴向移动的三维阴极射线管
🗣️ 情景例句
Do you speak a foreign language?
你会讲外语吗？
And our successful techniques, and to speak about our failures.
和成功技巧，并讲出我们的失败之处。
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。