调制深度增强，两主反射峰基本不变，而两主反射峰中间的次级峰个数增多，光强增大；

However, when the modulation depth is enhanced, the two main peaks does not shift, but the number of secondary peaks between the two main peaks increases and intensity is enhanced.

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结果表明，湿q矢量散度场的分布反映了次级环流的方向和强弱，暴雨出现在中尺度环流明显增强时。

The results show that the distribution of wet % Q % -vector indicates the direction and intensity of the secondary circulation. The heavy storm rain may occur when the mesoscale circulation enhanced.

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