I'm superstitious about the number 13.

我相信13这个数字不吉利。

《牛津词典》

A superstition is an irrational idea, like believing that the number 13 is unlucky!

迷信是一种不合常理的想法，比如认为13是不吉利的数字！

youdao

What's with the number 13?

数字“13”究竟暗示着什么？

youdao

The work is Mozart's Piano Concerto Number 13 in C Major.

VOA: special.2009.06.08

- Here, the secret is not a number 13, it's actually the build -- the diagram, the details, the gears, and the handles inside of this physical machine that constituted a secret.

这里，机密数字不是数字13，它实际上构造了-,一个图表，这个物理装置中的细节，传动装置，操纵,就构建成了一个机密。

哈佛公开课 - 计算机科学课程节选

y Hey, try using it to store the number 13 13 through the other pointer Y.

嘿，通过另外一个指针3,试着让它存储数字。

哈佛公开课 - 计算机科学课程节选

By the way, the number 13 is also thought by some to be unlucky.

FORBES: Lucky Thirteen: Trends for 2013

Turinui's selection is a surprise as Mat Rogers had been expected to take the number 13 shirt.

BBC: SPORT | Rugby Union | Internationals | Flatley returns to Aussie line-up

Grumman (number 10) was absorbed into Northrop, as was Westinghouse (number 11) and Litton Industries (number 13).

FORBES: How The Pentagon's Top Ten Contractors Dealt With The Last Downturn