The timbers of our country man made forest have poor quality and some defects, which indicate their low strength and unstable size.

我国目前人工林本材材质差、缺陷多，主要表现在强度低、尺寸稳定性差。

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Saihanba in Hebei Province was once a desert, but now it has become the biggest man-made forest in China.

河北省的塞罕坝曾经是一片沙漠，但现在它已经成为中国最大的人工林。

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But oil spills of the sort that now threaten the Timor Sea, forest fires like those that recently afflicted Greece, and other man-made and man-assisted threats to wildlife are transient.

但是如今威胁着帝汶海的石油泄漏、最近侵袭希腊的山火以及其它这类人为或者人力助长的对自然的威胁却都是转瞬即逝。

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The Forestry Commission survey of specially-created bat boxes revealed eight species living in the 155, 000 acre (63, 000 hectare) man-made forest.

BBC: Study shows Kielder Forest bats thriving

"If extreme droughts like these become more frequent, the days of the Amazon rainforest acting as a natural buffer to man-made carbon emissions may be numbered, " forest ecologist Simon Lewis, from University College London, has said.

CNN: Drought-stressed trees face race to adapt

The man-made pond, which is in a city-owned forest, is estimated to be 4 to 5 feet deep with a capacity of about 50, 000 gallons.

CNN: Maryland pond drained in anthrax probe