Thunderstorms often occur along the boundary—the weather front—where two air masses with different temperatures and/or humidities collide.
雷暴通常就发生在两者交界处，即两个温度或湿度不同空气气团相撞的地方（锋面，the weather front）。
Atmospheric boundary layer is influenced not only by the ground surface but also directly by the weather system of different scales.
大气边界层不仅受地面的影响，也受不同尺度大气系统的直接影响。
This is mainly associated with dust weather, turbulence of boundary layer and human activities.
这主要与沙尘天气的发生、大气层结稳定度和人类活动等因素有关。
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