Keystone state
na. 宾夕法尼亚州的浑名\\n
🧩 词语组成解析
keystone
[['ki:stəun]]
n. 拱顶石, 楔石, 重点
🗣️ 情景例句
Let's call room service and order a nice breakfast,
让我们打电话给房间服务部订一份可口的早餐。
An evil lesson is soon learned.
学坏容易。
I'm very glad to hear that.
很高兴听你这样说。