These frameworks offer structure and support for doing more complex tasks.

这些框架提供了执行更复杂的任务的结构和支持。

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Implemented by user, no special support needed from operating system, programming design of overlay structure is complex.

由用户执行，不需要操作系统的特别支持，覆盖结构的程序设计很复杂。

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This brush holder of technology and structure has obsolete technology, lack of support structure is complex and the friction coefficient.

这种刷握的技术和结构己陈旧过时，技术中的不足是支架结构复杂摩擦系数大。

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