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| physical layer | |||
| real layer | |||
| 实体层: 28 phrases in 14 subjects |
| Agriculture | 3 |
| Artificial intelligence | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Cartography | 1 |
| China | 2 |
| Electronics | 5 |
| Environment | 1 |
| General | 2 |
| Information technology | 1 |
| Multimedia | 1 |
| Space | 2 |
| Technology | 3 |
| Telecommunications | 4 |
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