Typically lasting only a few minutes, dust devils becoming visible as they pick up loose red-colored dust leaving the darker and heavier sand beneath intact.
尘埃风暴持续了仅仅数分钟，当风把稀疏的红色尘埃吹起留下了颜色较深、较重的沙土在下方时，尘埃风暴变得可见。
Protection system could prevent water and sand; and guarantee a long lasting life of the machine;
完善的防护系统能有效的防水防砂，使机器更加经久耐用；
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