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来源:雅诚德英语网
A large number of security personnel are on duty 24 hours to guard and protect the line.
一批大量的保安人员24个小时值勤守卫和保护线路。
A large number of security personnel are on duty 24 hours to guard and protect the line.
一批大量的保安人员24个小时值勤守卫和保护线路。