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| X 系统英国的一种数字交换系统 | |||
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X System : 27 phrases in 14 subjects |
| Agriculture | 2 |
| Automobiles | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 8 |
| Geology | 1 |
| Geophysics | 2 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Rail transport | 2 |
| Space | 2 |
| Sports | 1 |
| Technology | 2 |
| Telecommunications | 2 |
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