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
Pay more attention to the voice of youth.
多留意年轻人的意见。
No,I don't understand.
不，我不明白。
Class 3 were the winners!
3班获胜了！