Sometimes, though, people pass this normal age range for puberty without showing any signs of body changes.
然而有时，有些人过了一般发育年龄，却丝毫没有身体变化。
Sometimes, though, people pass this normal age range for puberty without showing any signs of body changes. This is called delayed puberty.
然而有时，有些人过了一般发育年龄，却丝毫没有身体变化。这个我们称作“迟来的青春期”。
After that, you can start with the second or third foreign language. I think the normal age would be around three or four years old.
到那时，你就可以开始教她第二或者第三语言了，这样算的话，三岁或四岁是比较合适的。
Normal age-re-lated memory loss is also linked to a loss of acetylcholine.
正常与年龄有关的失忆也与乙酰胆碱的流失有关。
The study, published in the journal Neuron, is part of an effort by researchers at Harvard University to understand the difference between normal, age-related declines and clinical impairment.
发表在《神经杂志》上的这项研究报告，是哈佛大学研究人员努力研究工作的一部分，目的是弄明白与衰老有关的、正常的人脑退化与临床损伤之间的区别。
The study, published in the journal Neuron, is part of an effort by researchers at Harvard University to understand the difference between normal, age-related declines and clinical impairment.
发表在《神经杂志》上的这项研究报告，是哈佛大学研究人员努力研究工作的一部分，目的是弄明白与衰老有关的、正常的人脑退化与临床损伤之间的区别。
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