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| systematic change | |||
| systematic variation | |||
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系统变化 : 26 phrases in 11 subjects |
| Aviation | 3 |
| Cartography | 1 |
| Commerce | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| Name of organization | 4 |
| Polymers | 1 |
| Rail transport | 2 |
| Space | 2 |
| Technology | 7 |
| United Nations | 1 |
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