注意黑色的钥匙如何被聚集在二和三。
当研究人员在第二和第三晚重复实验室里的实验时，他们发现在深度睡眠时左脑不能以同样的方式受到刺激。
When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep.
另一种现实主义手法是在布景中使用三维物体，如岩石和灌木，而不是二维绘制风景。
Another realistic touch was using three-dimensional objects on the set, like rocks and bushes as opposed to two-dimensional painted scenery.
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