有符号的除法要耗费更多的时间，因为除法是使最终结果趋向于零的，而移位则是趋向于负无穷。

The signed division will take more time to execute because it rounds towards zero, while a shift rounds towards minus infinity.

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拟移位映射是符号空间上一类特殊的混沌映射，被广泛关注。

Model shift maps is a class of special chaotic maps on symbolic space and received much attention.

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摘要：拟移位映射是符号空间上一类特殊的混沌映射，被广泛关注。

Abstract: Model shift maps is a class of special chaotic maps on symbolic space and received much attention.

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