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

也可用 木 锤敲击的方法，结合正、反转泵，使之疏通；

Drive a nail into wood a stake into the ground etc First hammer the tent pegs into the ground then tie the ropes onto them .

把钉子钉 入木中、把桩打进地里先 把系帐篷的桩子打进地里，再把绳子系在桩子上。