everythreeyears和everyfourthyear是同一个意思吗

everythreeyears和everyfourthyear是同一个意思吗？

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”)