In this paper, we study weakly chaos on sub-shift of symbol dynamical system, and give a weakly chaotic sub-shift whose topological entropy is zero.

本文讨论了符号动力系统子移位的弱混沌，并得到拓扑熵为零的弱混沌子移位。

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Teenagers, a symbol of the country after decades of appearance, we should not only study well, but also to study hard for our motherland.

青少年的努力，象征着祖国数十年后的容貌，我们不仅要好好学习，而且还要为我们的祖国而努力读书。

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Teenagers, a symbol of the country after decades of appearance, we should not only study well, but also to study hard for our motherland.

青少年的努力，象征着祖国数十年后的容貌，我们不仅要好好学习，而且还要为我们的祖国而努力读书。

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