Treelines
(treeline 的复数) n. 树木生长线（按海拔标示的树木生长上限）
🗣️ 情景例句
Good-bye, everybody.
各位再见。
He learns French every day.
他每天都学法语。
I didn't know he was the richest person in the world.
我不知道他是世界上最有钱的人。