Microbial cycling of such critical chemical elements as carbon and nitrogen helps keep the world inhabitable for all life forms.

微生物使重要的化学元素例如碳和氮进行循环，从而帮助保持这个世界能让所有的生物类型生存居住。

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Choose a good pair of cycling glasses that curve around the face and protect eyes from wind and other elements, without fogging up.

选择骑自行车眼镜的一双好曲线周围的脸并没有雾化起来，保护眼睛从风能和其他元素。

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Weathering and pedogenesis of rocks are important sources of mineral elements for ecological systems, and key processes of global biogeochemical cycling of mineral elements.

岩石风化成土作用是生态系统矿质元素的重要来源，也是全球矿质元素生物地球化学循环的重要环节。

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