On July 6, 1988, as part of routine maintenance, technicians removed and checked safety valves which were essential in preventing dangerous build-up of liquid gas.

在1988年7月6号，作为日常保养的一部分，技术人员检查阀门的安全，这在预防液态气体的危险中尤为重要。

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Moistening maintenance: Containing moisturizing compositions, it helps preventing the occurrence of water insufficiency and desquamation.

保湿： 含保湿成份， 帮助预防缺水及脱皮现象的出现。

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The author introduces the acid leakage of starting battery and its forming causes and proposes the preventing and maintenance measures.

介绍汽车起动用蓄电池爬酸的现象和形成机理，从使用角度分析爬酸形成原因，并提出预防和维护措施。

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The government argues that the higher costs of private borrowing are outweighed by the transfer of risk, preventing expensive construction overruns and maintenance bills.

ECONOMIST: The Treasury admits to problems with the PFI