Treeline
n. 树木生长线（按海拔标示的树木生长上限）
🗣️ 情景例句
Would it make you happy if I just gave up trying?
当初如果我放弃尝试的话你会高兴吗？
There is no royal road to learning.
治学无坦途。
Last week I went to the theatre.
上星期我去看戏。