Treeline
n. 树木生长线（按海拔标示的树木生长上限）
🗣️ 情景例句
We were both on the tennis team.
我们都是网球队的队员。
What does she mean by canceling her performance?
她取消自己的演出是什么意思？
The search proved difficult, for the puma was often observed at one place in the morning and at another place twenty miles away in the evening.
事实上搜寻工作很困难，因为常常是早晨在甲地发现那只美洲狮，晚上却在20英里外的乙地发现它的踪迹。