用over做前缀的词有：

overstudy

overwork

overact

overdose

overproduction

overcrowded

overlap

override

overwhelm

overbridge

overlook

overcome

overturn

overthrow

overhaul

用under做前缀单词的有：

underground

underwrit

underline

undersea

undermine

underling

underwear

underestimate

underplae

undersize

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