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| events in operation | |||
| event in operation | |||
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| event in operation; events in operation | |||
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作业 项目 : 7 phrases in 6 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Earth sciences | 1 |
| Name of organization | 1 |
| Project management | 1 |
| Technology | 1 |
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