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
Oh, Richard, it really isn't that bad.
喔 ，Richard ，事情没有那么糟。
The moon is a moon whether it shines or not.
或名或暗，月亮总是月亮。
He earned enormous sums of money and was paid as much as
100 for a single appearance.