Keystone correction
[电] 梯形校正
🧩 词语组成解析
keystone
[['ki:stəun]]
n. 拱顶石, 楔石, 重点
🗣️ 情景例句
she would call us.
她会打电话过来的。
He that travels far knows much.
见多识广。
he hardly ever used it, preferring always to go on foot.
但却很少使用，常常喜欢以步代车。