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| 非必需元素 | |||
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non-element : 55 phrases in 15 subjects |
| Agriculture | 3 |
| Aviation | 3 |
| Bridge construction | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Ecology | 3 |
| Electronics | 3 |
| Genetics | 2 |
| Metallurgy | 5 |
| Oil / petroleum | 2 |
| Polymers | 1 |
| Space | 2 |
| Technology | 24 |
| Telecommunications | 2 |
| Wind Energy | 2 |
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