What is the main reason behind this success?

这种成功最主要的原因是什么呢？

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Bruce Rioch's driving ambition is the main reason behind their new-found success.

布鲁斯·里奥克的勃勃雄心是他们新近成功的主要原因。

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Experts believe the main reason behind the phenomenon is the worsening employment market amid the current financial crisis.

专家认为这种现象是主要原因是目前的金融危机造成大学生就业形势恶化。

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Recent heavy rain has been cited as the main reason behind the increase.

BBC: Potholes rise on Somerset's roads

Revenue growth is the main reason behind the increase in the total number of companies on the private company list.

FORBES: America's Largest Private Companies 2012

About 1.45 million, or a third, of workless people cited long-term sickness or disability as the main reason behind their inactivity.

BBC: Number of workless households falls again, says ONS