Li Kuixian hold that lyricism is the essential element of poetry.
李魁贤认为抒情性是诗歌的本质要素之一。
The essential element is possession, and that possession must be lawful.
（占有留置的）必备要素是占有，且该占有必须合法。
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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