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.
这听起来十分有前途，但是据我所知，人们对可应用的规则已经进行了大量的研究。
This sounds promising, but as far as we know, substantial investigation of the applicable rules has yet to be done.
在我们了解到底有多少非法移民的孩子的出生是由于对美国公民地位的保证之前，广泛的研究是十分必要的。
Extensive studies would be necessary before one could know how many of the children of illegal immigrants were born here because of the guarantee of American citizenship.
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