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。

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The reason for the change is that now there are dozens of companies across the country buying discarded plastic soda bottles and turning them into fence posts, paintbrushes, etc.

这一变化的起因是，现在全国有几十家公司购买废弃的塑料汽水瓶，并把它们制成栅栏桩、油漆刷等。

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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