根据这项研究，有两个因素对“空白之地”湖泊的形成很重要：首先，那里的降雨十分猛烈。
According to the study, two factors were important for lake formation in the Empty Quarter: first the rains that fell there were torrential.
在这些地区，每个月的降雨量超过了上述定义中的量，所以一定有其他因素促成草原的形成。
In these areas, rainfall per month exceeds that in the above definition, so other factors must contribute to savanna formation.
学者称，阳光、温度、降雨和湿度都可能是造成这种效果的因素。
The researchers say sunshine, temperature, rainfall and humidity seem to be factors.
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