... negative-feedback amplifier 负反馈放大器 negative-going zero 声波波形负向零点 negative-going 负向的 ...
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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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