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| 灰区 (就业率颇低但又未低到可获得政府特别补助的地理区域) | |||
| 灰区 (常指多数导航系统不采用的频率段) | |||
| 灰色面积 | |||
| 灰区介于两个对立面之间 | |||
| gray area: 5 phrases in 4 subjects |
| Commerce | 1 |
| Earth sciences | 1 |
| International Monetary Fund | 1 |
| Space | 2 |
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