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| twilight zone | |||
| marginal lands; marginal region (指干旱区、半干旱区以及山区，是与经济发达地区相对而言的。边缘地区是今后人类拓宽生存空间的后备基地) | |||
| downcountry | |||
| marginal area | |||
| frontier area | |||
| backcountry; border area; border district; fringe area | |||
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| outpost | |||
| 边缘地区: 5 phrases in 4 subjects |
| Agriculture | 1 |
| Desert science | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |