Direct drive fans are available for many applications, and can reduce maintenance needs.

直接驱动风机得到了广泛应用并可减少维修需要。

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Green coverage in the city still needs to be expanded and green land maintenance needs to be strengthened.

全市绿化总体水平有待进一步提高，林木绿地养护管理也亟待加强。

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Before I critically review these trial data, however, the concept of maintenance needs semantic clarification.

然而，我认真地研究了这些试验数据之后，发现维持治疗的概念需要详解。

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"We know that most Housing Executive staff, overseeing those businesses contracted to respond to maintenance needs, are diligent and hard working, " she said.

BBC: PAC report says Housing Executive is 'out of control'

And what kind of maintenance steps needs to be done down there?

WHITEHOUSE: Daily Press Briefing

The apparatus which recycles human waste and turns "yesterday's coffee into into tomorrow's coffee needs frequent maintenance and would likely not survive years of continuous duty on Mars", he says.

BBC: Applicants wanted for a one-way ticket to Mars