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| iron A malleable ductile silvery-white ferromagnetic metallic element occurring principally in haematite and magnetite. It is widely used for structural and engineering purposes | |||
| iron | |||
| dip rod; proof rod; trying iron | |||
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| paring knives | |||
| jern: 182 短语, 21 学科 |
| 一般 | 34 |
| 冶金 | 45 |
| 劳动法 | 3 |
| 化学 | 20 |
| 医疗的 | 7 |
| 卫生保健 | 2 |
| 地球科学 | 1 |
| 市政规划 | 1 |
| 建造 | 1 |
| 技术 | 7 |
| 机械工程 | 1 |
| 材料科学 | 4 |
| 环境 | 13 |
| 电子产品 | 8 |
| 社会科学 | 5 |
| 经济 | 3 |
| 统计数据 | 1 |
| 行业 | 9 |
| 财政 | 1 |
| 运输 | 15 |
| 食品工业 | 1 |