短语词组短语Dust devil core area 沙尘暴核区strong dust devil 强沙尘暴dust devil sand column 旋风卷起沙子形成的柱状沙尘sand and dust devil 沙尘灾害dust devil formation 沙尘暴成因strong dust devil in spring 春季强沙尘暴 返回 dust devil