It's extremely cruel to perform an experimenton live animals.
对动物活体进行实验是一件极其残忍的事情。
2
When the researchers repeated the laboratory experimenton the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep.
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。
3
In his opinion, if the statement that humans cause global warming is correct, we should act—because we don't have another planet to experimenton.