如果 lgA 指数突然下降到某一水平以下，训练就会降低难度或完全取消。

If lgA levels suddenly fall below a certain level, training is eased or dropped altogether.

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要达到某一水平，只能多次练习。

You need to ractice many times to reach certain level.

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某一水平可以克服服装零售实体店在营业时间和市场范围的局限性。

A certain level could overcome the clothing retail entity shop during business hours and market scope limitation.

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