mole·hill /ˈmolˌhɪl/
鼴鼠丘,鼴鼠窩;蟻山
Mole·hill n. A little hillock of earth thrown up by moles working under ground; hence, a very small hill, or an insignificant obstacle or difficulty; as, to make a mountain out of a molehill.
Having leapt over such mountains, lie down before a molehill. --South.
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molehill
n : a mound of earth made by moles while burrowing