但是一些科学家指出，年轻人正在做着他们年龄该做的事情。
But some scientists say that is exactly what teens are doing.
一些科学家指出，心脏病死亡率的下降部分归功于心脏病医疗手段的提升，中年男子吸烟率的下降。
The drop in mortality, some scientists point out, is partly due to better treatment for heart disease and to a decline in smoking among middle-aged men.
一方面，一些科学家指出如果克隆一个胚胎，就可以制造出有价值的组织和器官，可以用来挽救人类的生命。
On the one hand, some scientists point out that if you clone a embryo, you can produce valuable tissues and organs that could be used to save human lives.
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