What have past behavioral studies found about our brain?
过去的行为研究对我们的大脑有什么发现？
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。
Studies show that physical and mental activity may improve brain health.
研究发现身体和智力上的锻炼都能使我们大脑更加健康。
However, many studies have suggested it's important to keep your brain stimulated.
然而，许多研究表明保持大脑激活的重要性。
However, many studies have suggested it's important to keep your brain stimulated.
然而，许多研究表明保持大脑激活的重要性。
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