一年一次、一月两次、一周4次、一天6次，猜猜它是什么？

偶然看到一个问题，蛮有意思的。觉得没必要全篇翻译，就仅择其要者而译之，并略加说明。谨致谢原文作者哈奇（前美国陆军第三战队一级准尉）。

Chief Hatcher,
Former US Amy Chief Warrant Officer at 3rd Brigade Combat Team

What comes once in a year, twice in a month, 4 times in a week and 6 times in a day?

什么东西一年来一次、一月来两次、一周来4次、一天来6次？

对我来说，这确实是道难题。
谜语，脑筋急转弯？

估计是不能用常规思维。

This is a very hard question for me to figure.

I could come up with several things but the answer would be different for each category and that, at least to me, is cheating.

按我的推理，要是一年出现6次，那就得一年出现2190（=365*6）次啊！
就问题的前半部分而言，随便回答哪一天，或者任何一个节假日，都行；

但这样的话，就对不上后面所说的每月、每周、还有每天了。
不对。因此，我还得接着想。

My reasoning tells me that if it happens six time in a day, it has to happen 2,190 times in a year. (365 times 6).

To answer the first part of the question, any holiday or date would work but it would not fit the month, week or day category,

so, to me, I have to keep looking.

注意：问题中并没有说“每一年，每个月，每周或每天”，它说的是“一年，一个月，一周，一天”。

英语里的冠词 「the 」与「a 」的区别，这里是不是很清楚了？

I think I have an answer that will work in all categories but I have to answer the question exactly as written.

For example, the question does not say “it comes every year, every month, every week or every day”.

Instead, it says it comes “in a year, a month, a week, and a day”.

我的答案似乎是…
英语里，星期一到星期天都是怎么说的，还记得吧？
: )