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| second order system; second-order system | |||
| secondary power system | |||
| secondary system | |||
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二次 系统 : 45 phrases in 13 subjects |
| Automobiles | 10 |
| Ecology | 1 |
| Electronics | 8 |
| Engineering geology | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 8 |
| Nautical | 1 |
| Refrigeration | 2 |
| Space | 1 |
| Technology | 8 |
| Telecommunications | 1 |
| United Nations | 1 |
| Water resources | 1 |
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