birthday [ˈbɜːθdeɪ] n. 生日
英英解释（牛津词典）：the day in each year which is the same date as the one on which you were born
birthday的特点：每年的这一天（the day in each year ）那一天和你出生的那一天是同一天（ which is the same date as the one on which you were born）
单词选自：人教精通版小学《英语》
转发、关注可私信获取“高清版脑图文件”根据艾宾浩斯记忆原理，请复习单词：索思英语解码单词（第446个）——day一天
索思英语解码单词（第444个）——history历史
索思英语解码单词（第441个）——moment片刻
索思英语解码单词（第436个）——north北方