every now and then 还是 now and then?表示不时?

every now and then 还是 now and then?表示不时? every now and then是什么意思? now and then 作文,Then and now now and then和every now and then的意思完全相同吗? now and then 与 every now and then 的区别是什么? every now and then和now and then 有什么区别? 请问now and then和every now and then again意思分别是什么? now and then 等于then吗? now and then等于什么 Every now and then和once in a while I our daily life,everyone fails every now and then