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
We live in California.
我们住在California 。
He is also very fond of playing tennis and manages to find time for a game twice a week.
他非常喜欢打网球，每周总要抽时间打两次。
was susceptible to a fatal virus disease, myxomatosis.
易患一种叫做"多发性粘液瘤的致命病毒性疾病。