他必须熟悉各种用于预防性的安全改进维护软件。
He must be for that familiar with the software for preventive and corrective maintenance.
设计、材料和制造工艺的改进，意味着今天的汽车安全行驶寿命比以往任何时期都长——尽管车主必须不断的进行维护和维修。
Improvements in design, materials and manufacturing mean that today's vehicles can be operated safely longer than ever, albeit at the cost of continuous maintenance and repair.
本文结合鹤矿集团南山煤矿和平煤集团二矿掘进二队对绞车的改造情况，着重阐述绞车安全改造和日常维护注意事项方面的改进。
Combining the winch improvement of Hegang group Nanshan coal mine with the second team of PingMei group, the safety transformation of winch and the considerations of daily maintenance are given.
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