For a undirected graph with tree characteristics, we can choose any node as the root.

对于一棵无向树，我们可以选择它的任意节点作为根。

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I wish I could have some tree characteristics: no matter what the years bring to it all the same calm strong and selfless.

我希望我能够具备一些树的特质：无论岁月带给它什么，都一样的从容坚强无私。

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These characteristics shape the leaves of the tree.

这些特征形成了树叶。

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The 5 complementary posters provide a wealth of information, both in Khmer and English, on the characteristics of the flooded forest ecosystem, as well as specific tree, bush, vine and aquatic species that can be found in the great lake.

UNESCO: OFFICE IN PHNOM PENH