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
Would you please make a record of all your foreign currencies?
请把你所带的外币登记一下，好吗？
I deeply regret my thoughtlessness.
我深为反省自己的轻率。
Our dog, Rex, used to sit outside our front gate and dark.
我家的狗雷克斯，过去常坐在大门外面叫。