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| hydrogen (hydrogenium) | |||
| hydrogen A flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding | |||
| hydrogen | |||
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hidrogenio : 160 短语, 19 学科 |
| 一般 | 12 |
| 农业 | 2 |
| 冶金 | 21 |
| 化学 | 42 |
| 医疗的 | 1 |
| 地球科学 | 11 |
| 技术 | 1 |
| 材料科学 | 2 |
| 环境 | 8 |
| 生态 | 1 |
| 电子产品 | 20 |
| 石油/石油 | 2 |
| 经济 | 1 |
| 能源行业 | 15 |
| 自然科学 | 4 |
| 药店 | 1 |
| 行业 | 1 |
| 运输 | 14 |
| 隔离 | 1 |