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| one-direction running; single-direction running | |||
| single running; single-track operation; unidirectional traffic | |||
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单向运行 : 10 phrases in 5 subjects |
| Commerce | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Rail transport | 3 |
| Technology | 4 |
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