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
You're still thinking about something to do, aren't you?
你还在想要找点事做， 是吗？
But Li Ming has promised to come home for the summer vacations.
但是李明已经答应暑假回家。
Combining exercise with the diet may be the most effective way to lose weight.
运动与节食结合也许是减肥最有效的途径。