The first reason is weather change.
第一个原因是天气变化。
A third reason is social intelligence.
第三个原因是社交智能。
One reason is how simple the sport is.
其中一个原因是这项运动非常简单。
The only reason is that it is a personal check.
唯一的原因就是这是一张个人支票。
One reason is that society rewards people who are thin and healthy-looking.
其中一个原因是，这个社会会优待苗条和看起来健康的人。
The reason is blindingly obvious.
原因十分明显。
原因很简单。
I suspect the reason is a deep-rooted love of fire.
我怀疑是出于对火焰根深蒂固的爱。
The reason is they relate to decisions you should make.
原因是它们关系到你应做的决定。
The reason is obvious: the graying of America means jobs.
原因是显而易见的：美国的人口老龄化意味着更多工作机会。
One reason is that going to the cinema is generally a social activity.
原因之一是，看电影通常是一种社交活动。
The chief reason is that American schools don't tend to seriously consider looking abroad.
主要原因是美国的学校往往不考虑向国外寻找校长。
第二个是实际方面的原因。
One reason is a problem of data.
其中一个原因是数据的问题。
“那究竟是什么原因呢？”
A third reason is energy security.
第三个原因是中国的能源安全。
Another reason is starting torque.
另外一个原因是启动扭矩。
One reason is low expectations.
原因之一是低期望值。
这是简单的物理原理。
The third reason is strategic.
第三个原因出于战略考虑。
The second reason is typically speed.
第二个原因通常是速度。
One reason is that it often fails.
原因之一就是它通常会以失败告终。
Answer: The reason is very simple.
答：原因是非常简单的。
One reason is that it's addictive.
其中一个原因是糖可以使人上瘾。
The reason is operator precedence.
原因是操作符的优先顺序。
One reason is the recession in America.
一个原因是美国经济的衰退。
One reason is the recession in America.
一个原因是美国经济的衰退。
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