operation of passenger transportation [交] 客运业务
Passenger train operation 旅客列车的运营
passenger transport operation 客运业务
passenger train operation plan 旅客列车开行方案
passenger operation
乘客操作
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The agency would start regulating space vehicles to ensure crew and passenger safety only if the operation of those vehicles resulted in death, serious injury or a dangerous close call.
MSN: Private-spaceflight bill signed into law
Steam passenger Tube trains were last in operation in 1907, but steam locomotives hauled freight and engineers' trains until 1971.
BBC: London
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