就好像我们无法控制投出去硬币的正反面一样，即使我们的日子在很长一段连续的时间里都很棒，我们也无法保证接下来的一天也会是个好日子。
The flip side of the coin is that if you’re having many good days in a row this is no guarantee that you’ll have a good day next.
电机驱动部分采用的是专门的驱动芯片来实现正反转控制。
The motor drive part is used in specialized drive chip to achieve positive control.
采用正反向混合推理控制策略及确定性理论来处理知识的不确定性问题。
The uncertainty problem of knowledge is solved by using the forward-backward inference control strategy and the certainty theory.
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