under- (too little， below) underdevelop， underdevelopment， underestimate， undergraduate， underground， underlie ， underline， undersea， underlying ， undermine ， underneath， underwear
neo- (new) neo-Nazism， neolithic
be- (cause to be or have) befriend， belittle
bio- (life) biology， biography ， autobiography， antibiotic， biochemistry， biosphere， biomedical
en- em- (cause to become， put into the stated condition) embody， empower， endanger， enlarge， enrich， encompass， enthrone， entrench
extra- (outside， beyond) extracurricular， extraordinary
mid- (middle) midday， midnight
poly- (many) polycentric， polydirectional， polysyllabic
pseudo- (not real， false) pseudomemory， pseudonym， pseudoscience
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