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Gas cars literally have hundreds of parts, often requiring frequent maintenance (保养).

天然气汽车部件十分繁杂，需要经常保养。

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Use this mode to perform any maintenance task, including tasks requiring the execution of SQL and DDL statements, when no other users are connected to the database server.

在没有其他用户连接到数据库服务器的情况下，使用这种模式可以执行任何维护任务，包括执行SQL和ddl语句所需要的任务。

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The House legislation contains a provision requiring a presidential report to Congress on U.S.government assurances to Israel regarding its security and maintenance of its qualitative military edge.

VOA: standard.2009.05.20

Helicopters are expensive and delicate machines requiring heavy maintenance, especially when flying in dusty conditions.

ECONOMIST: Choppers are vital��and hard to find

And it is high maintenance, requiring frequent touch-ups and spot checks for smudging.

WSJ: Very Bright Lipstick, All the Time

Slow-growth shrubs are definitely low-maintenance plants, requiring less pruning and creating less yard waste.

CNN: X-rated yards save the environment