脚背用英语怎么说？

脚背
instep
/ˈɪnstep/
He
had
shrapnel
up
to
the
knee,
his
ankle
was
severed
and
his
instep
was
blown
off.
他的膝盖中了弹片，踝关节被切断，脚背被炸飞了。

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