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trouble-free operation
busin.
无事故运行
el.
安全操作
;
无故障
met.
无故障操作
;
连续操作
;
无干扰运行
oil
无故障运转
tech.
安全运转
;
连续工作
;
无故障运行
;
顺利运行
trouble free operation
wind.
无故障运行
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