every four years和every fourth year一样吗?

every fourth year =every four years

every 与基数词、序数词、other 和few 连用，表示时间或空间的间隔，意为“每……；每隔……”。如：

He comes here every three days (every third day). 他每三天(每隔两天)来这儿一次。

You'd better plant a tree every five meters(every fifth meter). 你最好每(隔)5米种一棵树。(树的空间忽略不计)

Write on every other line. 隔行写。

every other day 每隔一天

every few days 每隔几天(注意“few”前没有“a”)

不一样的 every four years是隔三年 every fourth year 是隔四年