声波波形正向零点
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positive going zero crossover 从正到零的交叉
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But, if a field is fairly simple, you should be able to get some general feeling for whether your answer should be positive, negative or zero just by thinking about which way is my flow going.
但如果流速场很简单的话，大家理应有一种直觉，可以感受出来，结果应该为正为负，还是为零。
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