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
and she's crying.
她一直哭。
A man may lead a horse to the water, but he cannot make him drink.
牵马到河易，强马饮水难。
The pictures are on the wall.
画挂在墙上。