on a tree的用法和样例：
例句
- He caught his foot on a tree root and stumbled.
他一只脚被树根绊住而跌倒了。 - The annular markings on a tree indicate its age.
树的环形纹理显示其年龄。 - He tripped on a tree root.
他被一株树根绊倒了。 - Dead branches or wood on a tree.
枯枝，死木树上的枯枝或死木
on a tree的相关资料：
临近单词
Ongan
on
on -line examination database system
On the Accelerated Depreciation Method
On-line study network study platform
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on-line information retrieval system
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