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| tracking plan A formulated or systematic method for following or tracing environmentally related issues or concerns (为从事或追查与环境相关的问题或关切的一种程序化或系统化的方法。) | |||
| 跟 踪计划: 21 phrases in 7 subjects |
| Air defense | 3 |
| Aviation | 7 |
| Earth sciences | 2 |
| Electronics | 1 |
| International Monetary Fund | 1 |
| Space | 5 |
| United States | 2 |
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