Jose, as usual, had climbed a tree to keep watch.

乔斯一如往常地爬到树上放哨。

《柯林斯英汉双解大词典》

If you've explored the area before, keep an eye out for familiar sights—you may be surprised how quickly identifying a distinctive rock or tree can restore your bearings.

如果你以前曾探索过这一区域，请密切留意熟悉的景物——你可能会惊讶于，认出一块独特的岩石或一棵奇特的树竟能如此迅速地让人重获方向。

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The king became very angry at this, and ordered the gardener to keep watch all night under the tree.

国王变得非常生气，命令园丁整夜在树下看守。

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If you spray a tree, keep the water away from nearby power lines.

VOA: special.2010.01.12

"It's called the Quiver Tree and the large branches are hollowed out to keep arrows in."

VOA: standard.2010.08.09

It is said that the Romans often cut down a fir tree to keep in their houses during the sparse winter months as a form of appeasement to the goddess Ceres (originally Demeter, Greek goddess of the hearth).

FORBES: The Frosty, Festive World Of Investing

Originally used to keep livestock out of the native and exotic tree collections, they now also act as vehicle boundaries and help to guide visitors.

BBC: Ha-ha fences to be repaired at Westonbirt Arboretum

The Tree Council will plant more than 1, 000 trees across four sites and Keep Britain Tidy will plant 100, 000 trees across 750 sites.

BBC: Government launches ?4.2m urban tree-planting plan