Treeline
n. 树木生长线（按海拔标示的树木生长上限）
🗣️ 情景例句
No.
不是吧。
Would you tell Mr. Green that I called?
你能告诉格林先生我给他打了个电话吗？
It then sends these signals down an ordinary telephone line to another fax machine, which changes the signals back into the shapes of letters.
然后把这些符号通过一条普通的电话线送到另一台传真机上，传真机又把符号变为字母形状。