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
I now pronounce you husband and wife.
我现在宣布你们成为夫妻。
I need the change for the stamp machine.
我需要投入自动售邮票机的零钱。
Just let me know which day.
决定好哪一天就告诉我。