The major systems come from the shear line of low-layer, the low trough of upper air and the ground stationary front.

主要影响系统来自低层切变线、高空低槽和地面静止锋；

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The major systems come from the shear line of low-layer, the low trough of upper air and the ground stationary front.

主要影响系统来自低层切变线、高空低槽和地面静止锋；

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