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| 层次模型 | |||
| 分层模型; 分级模型 | |||
| 等级式模型; 递阶模型 | |||
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| 等级式模型; 递阶模型; 层次模型; 分层模型 | |||
| hierarchical model: 21 phrases in 7 subjects |
| Artificial intelligence | 1 |
| Business | 2 |
| Computer networks | 5 |
| Electronics | 1 |
| Information technology | 2 |
| Space | 3 |
| Technology | 7 |
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