Extra risk factors : being overweight or over 40 .

危险系数更高的人群是一些肥胖或者40岁以上的人。

How important are these factors ?

这些因素有多重要？

It depends on many factors .

这取决于很多因素。

Several factors are at work .

有几个因素在起作用。

Other factors were at work .

其他一些因素也有影响。

There are other complicating factors .

还有其它一些复杂的因素。

Seasonal factors played a role .

季节性因素是原因之一。

Religion and culture are important factors .

宗教和文化是重要因素。

There are two primary factors .

有两个主要的影响因素。

Many factors influence economic performance .

有很多因素影响经济的表现。