也可用木锤敲击的方法，结合正、反转泵，使之疏通；

Wood can also be used percussion hammer approach, combined with positive and reverse pump to dredge;

youdao

也可用木锤敲击的方法，结合正、反转泵，使之疏通；

Wood can also be used percussion hammer approach, combined with positive and reverse pump to dredge;

youdao