The findings suggest that things like land rights, markets or government policies can influence tree planting and protection.

VOA: special.2009.09.01

One of the things that we discussed was this type of imagery here where you have vertically these pillars, if you will, or we could even call--the more I sort of looked at this--sort of call them tree trunks almost.

我们讨论的问题之一是这里的这种意象，这些垂直的柱子，如果你愿意的话，我们可以称之为，我越看越觉得称之为树干比较好。

耶鲁公开课 - 聆听音乐课程节选

So if on each iteration of merging I'm doing eight things or more generally, N. That then begs the question, how many levels of this tree are there actually?

可见对于合并我需要迭代8次,一般情况下是N，这取决于具体问题，那么在这棵树中一共有多少层呢？

哈佛公开课 - 计算机科学课程节选

Plant expert Doug Welsh says when you prune a rosebush, crape myrtle or shade tree, first remove dead, broken or diseased parts.

VOA: special.2009.10.06

It can affect a large area or just individual trees or even part of a tree.

VOA: special.2009.11.10

You can also wrap a tree in palm tree frond leaves, cornstalks or fiberglass.

VOA: special.2010.01.12

Small pieces of tree bark or cut up leaves can be used.

VOA: special.2009.06.30

Buckley isn't an archaeologist. He studies tree rings, which record the growth history of trees that can be hundreds of years old, or even older.

VOA: standard.2010.04.05