Every now and then和once in a while完全一样嘛?

every now and then是什么意思? every now and then和now and then 有什么区别? now and then和every now and then的意思完全相同吗? 请问now and then和every now and then again意思分别是什么? every now and then 还是 now and then?表示不时? 关于now and then的英语问题now and then和every now and then的意思和用法有什么区别? every now and then often和“often”使用上有什么区别? Every now and then和once in a while完全一样嘛? now and then 与 every now and then 的区别是什么? Every now and then sunshine is warm making life extremely now and then 和 now and again 的区别? now and again和now and then意思相同吗? every now and then是什么语法现象 特别不知道every在这干什么? I see him every now and then,but not often.这里的every是什么用法? kicks in every now and then and checks for problems like this and reports back. now and then 急 作文,Then and now now and then