鞭长莫及
Beyond one's grasp.
Out of reach.
eg：I cannot help him because it is beyond my grasp.
中英俚语俗语来源：左传：“虽鞭之长，不及马腹。”
同义词：远水不救近火 Water afar off quencheth not fire.
反义词：信手拈来 Come in handy.
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