I thought, this is why I've travelled thousands of miles.

我想，这就是我走了几千英里路的原因。

《柯林斯英汉双解大词典》

This is why they must be free.

这就是为什么他们必须是免费的。

youdao

This is why I chose you, Blazer.

这就是我选择你的原因，布雷泽。

youdao

This is why there are white and light colored buildings in many warm areas of the world.

VOA: special.2009.06.19

So this is one more example of stressing why I only want to come access to the instances through defined methods.

其他相关的值也会变化,我想要这些值会一起变化,这就是另外一个强调为什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

That is why this says atomic number, but for most intents and purposes we can say this could be atomic mass.

那就是为什么这里说原子序数，但如果没有意图和目的,我们就说是原子质量。

麻省理工公开课 - 固态化学导论课程节选

If they have, say, a 20 vote margin in the House of Representatives, Colombia's chances are good, but if it is very close....This is why it is so important for us to move forward with other FTA's.

CENTERFORSECURITYPOLICY: Free trade: An antidote to Chavez

This is what the U.K. has been doing and this is why it keeps its AAA rating.

FORBES: Three Questions Facing Capitalism

What this decade is all about is the U.S. becoming more and more like China, and China becoming more like the U.S. This is why I am so bullish on the global growth.

WSJ: Our Chat With the 'Bric' Builder �� Questions, Questions | WSJ.Money Spring 2013