请问:male female是单还是复数?我总记不住单词是否可数,是单是复.怎么办?

male 和female两词比较特殊,即可为单数,也可为复数,如下：以male为例：Men and boys are sometimes referred to as males when they are being considered as a type.He was very anxious to prove he was a red-blo...