英語寓言故事 The Serpent and the File

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A Serpent in the course of its wanderings came into an
armourer's shop. As he glided over the floor he felt his skin
pricked by a file lying there. In a rage he turned round upon it
and tried to dart his fangs into it; but he could do no harm to
heavy iron and had soon to give over his wrath.


It is useless attacking the insensible.