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| closed system (与开口系统 (open system) 相对) | |||
| 封密系统: 26 phrases in 12 subjects |
| Automobiles | 1 |
| Business | 2 |
| Compressors | 1 |
| Electric machinery | 1 |
| Electronics | 6 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Navigation | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 7 |
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