无孔不入（無孔不入）　

◎ 无孔不入 wúkǒng-bùrù

[(of odours,ideas,etc.)be all-pervasive;make one‘s way into every nook and coners;seize every opportunity to do evil] 没有什么孔隙不钻入的。比喻消极的东西易于渗透、侵入。亦指人善于钻营,有隙就乘机营求