The telephone wires were blown down by the rainstorm.

电话线被暴风雨刮落了。

Backwashingable filter can blow down at any moment and backflush the filter without pumping off,which improves the application effect,reduces the cost and elongate the working life.

可反清洗器在的情况下时排污和层进行反清洗作业,提高了使用效果,降低了使用成本,延长了使用寿命。