他们发现真菌从空气中获得氮元素。
They found that the fungus was getting nitrogen from the air.
氮是一种不稳定的元素。
这显示的是哪个元素？对，是氮。
氮是最常见的元素，它无害。
Nitrogen is the most common element in the atmosphere and is harmless.
硝酸盐中含有氮，而氮是维持生命的必要元素。
Nitrates are compounds that contain nitrogen, an element essential for life.
硝酸盐中含有氮，而氮是维持生命的必要元素。
Nitrates are compounds that contain nitrogen, an element essential for life.
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