二的英語翻譯：

twin; two
【計】 binary-coded decimal; binary-coded decimal character code
binary-to-decimal conversion; binary-to-hexadecimal conversion
【醫(yī)】 bi-; bis-; di-; duo-

頭的英語翻譯：

beginning or end; cobbra; conk; crumpet; end; first; garret; hair; head
leading; nob; noddle; pate; sconce; side; top; twopenny
【醫(yī)】 capita; caput; cephal-; cephalo-; head; kephal-; kephalo-