| 正面 | 5158.hydrogen 英 ['haɪdrədʒ(ə)n]美 ['haɪdrədʒən]     |
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| 背面 |     释义： So called because it forms water when exposed to oxygen.顾名思义，就是遇氧可以生成水的气体。n. [化学] 氢 例句： 1. Hydrogen is used extensively in industry for the production of ammonia.氢气在工业上广泛用于制氨。 hydrogen 氢，氢气hydro-,水，-gen,生成，词源同generate.因氢接触氧气生成水而得名。 hydrogenhydrogen: [18] Greek húdōr ‘water’ (a distant relative of English water) has been a prolific source of English vocabulary. Amongst its contributions are hydrangea [18] (literally ‘water-vessel’, so named from the cuplike shape of its seedpods), hydrant [19], hydrate [18], hydraulic [17] (literally ‘of a water-pipe’), hydrofoil [20], and hydroponics [20] (literally ‘water-culture’). Hydrogen itself means literally ‘generating water’, and was coined in French as hydrogène in the late 1780s for hydrogen’s property of forming water when oxidized. It is first recorded in English in 1791.=> waterhydrogen (n.)1791, from French hydrogène, coined 1787 by G. de Morveau, Lavoisier, Berthollet, and Fourcroy from Greek hydr-, stem of hydor "water" (see water (n.1)) + French -gène "producing" (see -gen). So called because it forms water when exposed to oxygen. Nativized in Russian as vodorod; in German, it is wasserstoff, "water-stuff." An earlier name for it in English was Cavendish's inflammable air (1767). Hydrogen bomb first recorded 1947; shortened form H-bomb is from 1950." |