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
I gave that idea up a long time ago.
我很久以前就放弃了那个想法了。
He has never been out of China, so he is very excited about liveing abroad.
他以前从未出过国，因此对出国很兴奋。
Fierce wars between Native Americans and European settlers broke out.
美洲土著人和欧洲殖民者之间发生了激烈的战争。