They measured the rings,or circles, inside thousands of ancient trees in more than three hundred places.

VOA: special.2010.05.25

He went out and saw his mum in the trees, in the clouds, or when the birds were singing.

他走出去，看到自己的母亲,在树上，在云里，在鸟儿的歌声中。

普林斯顿公开课 - 人性课程节选

Telling white pioneers that they could no longer shoot game in the boundaries of Yosemite National Park to feed their families or cut down trees for firewood was much harder.

VOA: standard.2009.11.25