[U]氫 colorless and smell-less gas which burns very easily
英英釋義
Noun:
a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
hydrogen的用法和樣例：
例句
用作名詞 (n.)
Hydrogen is highly explosive. 氫極易爆炸。
Hydrogen and oxygen are gases. 氫和氧是氣體。
A molecule of water consists of two atoms of hydrogen and one atom of oxygen. 水分子含有兩個氫原子和一個氧原子。
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