a form nutrient
形式营养物
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Until the 20th Century, the nutrient element only came to Earth in a reactive form that is usable by plants and animals, thanks to certain microbes in soil and water (and to a smaller extent in lightning strikes).
BBC: Leaving our mark: Fossils of the future
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