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
Jogging is a popular form of exercise.
慢跑是一种十分普及的体育活动。
I believe there is no way out of this forest.
我相信没有路可以从这森林走出去。
Sandy was so sick that she threw up all over the bathroom floor.
三滴病了，吐了洗手间一地。