Which element is shown here? Yeah, nitrogen.
这显示的是哪个元素？对，是氮。
Nitrogen is the most common element in the atmosphere and is harmless.
氮是最常见的元素，它无害。
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.
硝酸盐中含有氮，而氮是维持生命的必要元素。
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