a small effort; the effort needed to blow away a speck of dust ? 若是我兩個(gè)引進(jìn)你，乃～。(《西游記》四十四) If both of us introduce you,it will just be a small effort.
吹灰之力
just a small effort 不費(fèi)～ without the least effort
吹灰之力chuī huī zhī lì
形容非常小的力量。just a small effort, as easy as blowing away a speak of dust