传统的CSG实体显示方法不仅费时，而且难以控制明暗效果。

The traditional shading methods for CSG models are not only costly, but also inefficient to control the shading effects.

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由于混合动力汽车结构比传统汽车更加复杂而且难以控制，因此混合动力汽车的开发应建立在试验台架的基础上进行分析研究。

Comparing with HEV and traditional vehicle, HEV is hardly controlled, so the development of HEV is based on the analysis and study of HEV test bed.

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例如，它难以正确使用，root用户还是可以从中脱离，而且它根本不去控制网络访问。

For example, it's hard to use correctly, root users can still escape from it, and it doesn't control network access at all.

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