A coveralled maintenance worker ran into the lobby .
一个穿着工作服的保养工奔进门厅。
Instruct and training the maintenance worker on production line.
指导和培训生产线维修人员的工作；
The cause of this accident is the mistake on changing parts by maintenance worker.
发生事故的原因是设备维修人员错误更换零部件造成的。
The cause of this accident is the mistake on changing parts by maintenance worker.
发生事故的原因是设备维修人员错误更换零部件造成的。
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