There are many theories as to why Friday the 13th is considered an unlucky day. Aside from that whole horror movie thing, there are some old reasons why thisday has inspired so many superstitions.

　　关于为什么13号撞上星期五被认为是不吉利的日子，有很多说法。除了恐怖电影以外，还有一些流传已久的原因可以解释为什么这一天会引发如此多的迷信。

　　Can you honestly say that you’ve never felt a slight pang of concern when waking up on the morning of Friday the 13th?

　　老实说，当你在13号的星期五早上醒来时，你从来没有感到一丝忧虑吗?

　　You’re not alone. Maybe it’s “triskaidekaphobia”, the fear of the number 13, that gets you down. But, if 13s don’t bother you unless it’s Friday, you might be susceptible to what’s sometimes known as “paraskevidekatriaphobia” or “friggatriskaidekaphobia”, instead. Whether you plan on purposely walking under ladders with black cats this Friday or staying tucked in bed, it’s worth diving into why Friday the 13th has a bit of a reputation.

　　你不是唯一一个有这种感觉的人。也许是对数字13的恐惧让你沮丧。但是，如果13对你来说不算什么，除非是星期五，你可能会患上一种有时被称为对“黑色星期五”的恐惧的疾病。无论你是打算周五和黑猫一起在楼梯下散步，还是躺在床上，都有必要探究一下为什么13号的星期五会有点“臭名远扬”。

　　Why do people fear the number 13?

　　为什么人们害怕数字13?

　　First, let’s get into 13. While many cultures have an issue with the odd number, there’s no one set of circumstances that would make it decidedly unlucky.

　　首先，让我们探究一下13这个数字本身。虽然很多文化都对奇数有异议，但没有任何一种情况会让奇数变得绝对不吉利。

　　Common theories behind the fear of 13 include:

　　恐惧背后的常见理论包括

　　1. Viking lore,where the unsavory Loki is believed to be the 13th god in the Norse pantheon.

　　1、在北欧海盗的传说中，令人讨厌的洛基被认为是北欧万神殿中的第13位神。

　　2. a biblical reference to the 13 people reportedly sitting at the table for Jesus’s last supper.

　　2、圣经中提到的与耶稣共进晚餐的是13个人，而这是“最后的晚餐”。

　　3. numerology,where 13 is in low regard because it follows 12,a very “complete” number.

　　3、在数字命理学中，13不受重视，因为它跟在12后面，12是一个非常“圆满”的数字。

　　But, if you ask an architect why they omitted the 13th floor from a high-rise, they probably won’t bother citing a source for their superstition.

　　但是，如果你问一个建筑师，为什么他们把高层建筑的第13层省略掉了，他们可能不会为他们的迷信引证来源。

　　Why is Friday the 13th unlucky?

　　为什么13号的星期五是不吉利的?

　　Friday was named for one of two Norse goddesses, Freya or Frigga. While exclaiming “TGIF” is common now, some traditions consider “Frigga’s Day” to be unlucky. That’s not the only theory as to why Friday the 13th is unlucky though. Some Christians believe that Christ was crucified on a Friday. Friday was also once known as “hangman’s day” in ancient Rome and Britain because it was usually the day that condemned people would be hanged.

　　星期五是以两个北欧女神其中的一位的名字Freya或Frigga来命名的。虽然现在“TGIF”(Thank God It's Friday: 感谢上帝今天已是星期五)很常见，但一些传统观念认为“Frigga’s Day”是不吉利的。但这并不是唯一一个解释为什么13号的星期五不吉利的理论。一些基督徒认为耶稣是在星期五被钉死在十字架上的。在古罗马和英国，星期五也曾被称为“刽子手的节日”，因为这一天通常是有罪之人被处以绞刑的日子。

　　It’s likely that these two sets of unlucky lists just add up to make Friday and thirteen an intense combination for superstition. And of course, if you’re expecting unlucky things to happen, you might even change your habits on days like this. Multiple studies speculate that businesses lose millions of dollars in revenue each Friday the 13th because some people avoid regular behaviors like traveling or making investments.

　　很可能这两组不吉利的数字加起来，使得星期五和十三成为迷信的“强强组合”。当然，如果你预料会有不幸的事情发生，你甚至可以在这样的日子改变你的习惯。多项研究推测，每个13号的星期五，一些企业都会损失数百万美元的收入，因为有些人会避免旅行或投资等常规行为。