Like brown bears and polar bears, sloth bears may have evolved in an environment with few trees.

和棕熊和北极熊一样，树懒熊可能是在树木稀少的环境中进化而来的。

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Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs.

黑熊幼崽用树来防御，而经常生活在没有树的环境中的棕熊和北极熊则依靠攻击性来保护它们的幼崽。

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Hidding among the flowers, trees and hills, white walls stand in a sharp contrast to the grey tiles and brown Windows.

隐秘在花丛，树丛，小山丛中的白墙与灰瓦褐窗形成强烈的反差。

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The sun rarely shines. The leaves on the trees are brown or have fallen to the ground.

VOA: special.2009.01.26

His father,Joe Brown, had a job removing fluids from pine trees in the surrounding woods.

VOA: special.2010.05.16

Colorful beaded necklaces dangle from the branches of brown-paper trees that line the walls, and old-fashioned black metal streetlamps line the hallway.

FORBES: Magazine Article

Ahead of them a horse whinnied in the timber and then, through the brown trunks of the pine trees, only a little sunlight coming down through their thick, almost-touching tops, he saw the corral made by roping around the tree trunks.

NPR: Robert Jordan, Hemingway's Bipartisan Hero

People belonging to the brown bin scheme can leave their trees beside the bin or cut them up and put them in the bin.

BBC: NEWS | UK | England | Norfolk | Green Christmas urged by council