他每隔一段时间理一次发
he has his hair cut once in a while.
曾经有一段时间他是一名教师
there was a time that he was a teacher
有一个:once in a while1偶尔;有时;时不时
亲,
他每隔一段时间理一次发
he has his hair cut once in a while.
曾经有一段时间他是一名教师
there was a time that he was a teacher
有一个:once in a while1偶尔;有时;时不时
亲,