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| 金属结构 (The two cast irons contain 2.4 to 4.0 per cent of carbon but the difference lies in the condition in which the major portion of the carbon exists in the structure of the metal. 这两种铸铁都含有2.4% -4.0%的碳，但二者的大部分碳在金属结构中的存在状态却不相同。) | |||
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structure of metal : 10 phrases in 3 subjects |
| Bridge construction | 1 |
| Metallurgy | 8 |
| Technology | 1 |
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