对于选项采用两级分类

Present a two-tiered set of options.

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对供应商维护实现两级分类，类的顺序可进行调整。

Suppliers to achieve the maintenance of two categories, type of order can be adjusted.

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该系统是由两级分类器组成，这样既加快了系统检测速度，又保证了其检测精度。

Due to its two level structure, the system detecting speed is accelerated and its recognition rate is also improved.

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