a tree中文

• 樹狀
• 一棵樹
• 一蔸樹

• tree:    n. 1.樹〔主要指喬木，也可指較大 ...
• in a tree:    在樹上
• in the tree:    在樹上（非樹本身）

例句與用法

1. He crossed the river by the aid of a tree .
   他借助于一棵樹過了河。
2. Her car ran off the road and hit a tree .
   她的車離開馬路，撞在一棵樹上。
3. A tree is a connected graph with no cycles .
   一個樹是一個沒有圈的連通圖。
4. George washington had chopped down a tree .
   喬治華盛頓曾經砍倒了一棵樹。
5. Stranded, he sat with his back to a tree .
   他束手無策，只好靠著一棵樹坐下。