These fats are man-made and do not exist in nature.

这些油脂是人造的的和在自然界中是不存在的。

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Photographs typically capture the presence of nature and are often free of man-made obstructions.

照片的特色在于捕捉自然之风采，往往不受人为障碍的约束。

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Colour additives belong to one of two groups: pigments derived from natural sources such as vegetables, minerals or animals and those not found in nature and must be man-made.

色素添加剂划分成两大类：从自然资源中(如植物，矿物，动物)获得的天然色素和不能在自然界中找到的人造色素。

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Man-made technology is great, but Mother Nature is the greatest inventor of them all -- and scientists are discovering new ways to take advantage of the tools found in nature.

ENGADGET: Inhabitat's Week in Green: fluorescent bulb moon, fuel-efficient supersonic jet and a toxin-eating oyster park

In part, Mr Picou says, this is due to the nature of man-made disasters.

ECONOMIST: The Exxon Valdez

Those approaches are mostly based on so-called metamaterials, man-made materials with properties that do not occur in nature.

BBC: Acoustic 'cloaking device' shields objects from sound