Before considering each of the three causes above in more detail, let's first look at some background to help you better understand why this happens at all.

在详细讨论上述三个原因之前，我们首先了解一些背景知识，以便更好地理解这种错误发生的原因。

youdao

What are the three causes of Avian Flu?

导致禽流感的三个原因是什么？

youdao

The top three causes of the accidental injury are: road accident injury (43.4%), drifting-down injury (31.7%) and the bruise injury caused by heavy object (12.8%).

造成意外伤害的原因前三位是交通伤(43.4%)、跌落伤(31.7%)、重物砸伤(12.8%)。

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WHO reports more than three-and-a-half million people die every year from malnutrition-related causes.

VOA: standard.2010.01.02

Too many leaders fail under pressure, and not accepting responsibility is one of the three causes of it.

FORBES: Leadership

Trevor gives three causes for the financial crisis.

FORBES: Wizards, Witches, and Flying Monkeys

Some scouting and musing revealed three primary causes of increased complexity of composite applications.

FORBES: The Web Services Dilemma