Earlier studies have documented half brain sleep in a wide range of birds.
早些时候的研究已经记录了种类广泛的鸟类的半脑睡眠。
Some studies have also found an impact for men, though a less noticeable one.
尽管并不引人注目，一些研究还是发现了一个对男性的影响。
Careful studies have demonstrated, however, that this is not the case.
然而，谨慎的研究表明，情况并非如此。
Previous behavioral studies have shown that learning new information can lead to forgetting.
先前的行为研究表明，学习新信息后会导致遗忘。
But what do studies have to say?
但是，研究结果是怎样的呢？
A number of studies have shown this.
很多研究也证明了这一点。
The studies have not been made public.
研究过程并未公开。
The same studies have been done in Asia.
同样的研究也在亚洲。
That's similar to what other studies have found.
这类似于其他的研究发现。
A few previous studies have hinted at the possibility.
以前的几个研究已经暗示这种可能性。
Many studies have shown that income inequality is rising.
许多研究表明收入不平等正在扩大。
But plenty of other studies have shown no such relationship.
但很多其它研究显示这样的关系并不存在。
Several studies have tried to answer this with cold, hard data.
有些研究已经试图利用客观确凿的数据来回答这一问题。
Previous studies have shown that people blink more when lying.
过去的研究证明当人们撒谎时，眨眼更频繁。
But those same studies have shown that cancer is devilishly complicated.
也正是这些研究说明癌症非常复杂。
Previous studies have also linked screen time with attention problems.
之前的研究也将花在屏幕前的时间与注意力问题挂钩。
But few studies have looked at what happens once the gas is in the ground.
但是，埋藏在地下的温室气体会发生什么变化？关于这方面的研究很少。
Many studies have shown that people with strong relationships are happier.
众多研究已经表明有良好的人际关系的人更加快乐。
Past studies have shown that infants babble better in their mother's presence.
先前的研究表明，婴儿当着母亲的面就嘟嘟得起劲。
Recent studies have shown that we've forgotten how to read simple care labels.
最近的研究表明，我们已经忘记如何阅读简单的护理标签。
Recent studies have shown clutter is actually bad for your health. (Gee, really?)
最近的研究表明，杂物不利于健康(天哪，真的？)
Other studies have shown that black tea also has benefits for cardiovascular health.
此前已有研究表明红茶对心血管健康也有好处。
Previous studies have shown that losing a few key workers can destroy an insect society.
先前的研究已经证明失去几只工蜂能够毁灭整个昆虫社会。
Several gender studies have pointed out that women behave and manage differently to men.
数个关于性别方面的研究指出，女性的行为和管理方式不同于男性。
Previous studies have shown that letting fly with a few choice expletives can ease pain.
先前的研究表明，偶尔爆几句粗口可以减轻疼痛。
Previous studies have shown that letting fly with a few choice expletives can ease pain.
先前的研究表明，偶尔爆几句粗口可以减轻疼痛。
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