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
Not a bad slogan.
不错的标语。
An ambulance will be here in no time.
救护车马上就到。
The railway station was big, black and dark.
火车站很大，又黑又暗。