Keystone effect
[电] 梯形效应
🧩 词语组成解析
keystone
[['ki:stəun]]
n. 拱顶石, 楔石, 重点
🗣️ 情景例句
to talk to someone at the bank next week.
下星期与银行的人谈一谈。
A policeman pricks up his ears.
一个警察竖起耳朵在认真地听着。
So are the fish!
鱼也小呀！