YOU SAID:

Kevin is under average size

INTO JAPANESE

ケビンは平均サイズの下

BACK INTO ENGLISH

Kevin is the average size

INTO JAPANESE

ケビンは平均サイズです。

BACK INTO ENGLISH

Kevin is the average size.

INTO JAPANESE

ケビンは、平均サイズです。

BACK INTO ENGLISH

Kevin is an average size.

INTO JAPANESE

ケビンは、平均サイズです。

BACK INTO ENGLISH

Kevin is an average size.