common “普通的,一般的”側重常見的常有的,人人皆知的,如:Apples are very common in North China.蘋果在華北很常見.也可指“平凡的等”,如 the common people 平民.
normal “正常的,标準的,普通的” 側重與常規,标準等一緻,如 the normal temperature of the human body.人的正常體溫The baby's weight is normal.
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