There is no earthly reason why they should ever change.

他们毫无理由改变。

《柯林斯英汉双解大词典》

The first reason is weather change.

第一个原因是天气变化。

youdao

Usually characters change as the story goes on, so the theme you get at the beginning might not be true at the end! For this reason, you need to read through the whole text first.

通常角色会随着故事的发展而变化，所以你在开始时读到的主题在结尾时可能不是真的！出于这个原因，你需要先通读整篇课文。

youdao

Another reason is that a small change in temperature can mean the difference between snow and rain.

VOA: special.2010.01.05

Helen chose you without reason because she loves you without cause; embrace her without question and watch your weather change. Let go.

海伦毫无理性地选择了你，因为她对你的爱,也无原因，别问什么，拥抱她,看着你的境遇变迁，放开。

耶鲁公开课 - 1945年后的美国小说课程节选

But the mere fact that they would change your behavior doesn't yet tell you whether they're reason-generating facts.

但仅仅是它们会改变你的行为这个事实,并没有告诉你它们是否是产生原因的事实。

耶鲁公开课 - 死亡课程节选

For the first time, restaurants have a compelling business reason to change their dietary ways.

FORBES: Don't Supersize Me: Chain Restaurants Must Cut Calories For Their Own Business Good

Many of us are inclined to stick to doing something unless there's a good reason to change.

BBC: Energy switching: Why the customer inertia?

And for most companies of a certain size, there is no compelling reason to change your Microsoft infrastructure.

FORBES: Why Most Businesses Will Keep Buying Microsoft