难于，拼音是nán yú，是一个汉语词汇，释义为相当不容易。
天下之事，不难于立法，而难于法之必行 the greatest challenge for a country lies not in making laws; but in putting those laws into effect.
难于上青天 Impossible for the county
难于接近的 inaccessible ; be difficult of approach
难于登天 Extremely hard
微妙的难于捉摸的 subtle
比喻难于接受 knotty ; thorny ; difficult to handle or manage
难于教育的 ineducable
难于煎煮 It was difficult to decoction ; Hard boiling ; Difficulty boiling
难于形容的 unspeakable
难于形容 beyond description ; Unspeakable
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