小巫见大巫

xiǎowū jiàn dàwū

[like a small sorcerer in the presence of a great one--feel dwarfed; pale into insignificance by comparison; the moon is not seen where the sun shines] 小巫师见了大巫师, 法术就施展不开了。 比喻两者之间高下悬殊, 差距太大, 不能比拟

今景兴在此, 足下与子布在彼, 所谓小巫见大巫, 神气尽矣。 --汉·陈琳《答张紘书》