氫 qīng ammonia Definitions Defs Origin Strokes Stroke Words Sentences Sents 2 sentences 氢是最轻的元素。 qīng shì zuì qīng de yuánsù. Hydrogen is the lightest element. Source: Tatoeba科学家正致力于研发以氢为能源的客车。 kēxuéjiā zhèng zhìlì yú yánfā yǐ qīng wéi néngyuán de kèchē. Scientists are working on developing buses powered by hydrogen. Source: Dong Chinese Dictionary