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| tunnel section laid in heading | |||
| tunnel | |||
| tunnel A underground passageway, especially one for trains or cars that passes under a mountain, river or a congested urban area | |||
| channel; trend channel | |||
| canyon | |||
| subway | |||
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| narrow fluctuation margins against the dollar; tunnel | |||
| tunnel: 58 phrases in 12 subjects |
| Agriculture | 5 |
| Communications | 1 |
| Construction | 3 |
| Earth sciences | 5 |
| Electronics | 14 |
| Finances | 1 |
| General | 3 |
| Information technology | 2 |
| Mechanic engineering | 1 |
| Medical | 2 |
| Microsoft | 1 |
| Transport | 20 |