它在青年时期达到顶峰，在一段时间内趋于平稳，然后普遍会开始随着年龄的增长而缓慢下降。
It peaks in young adulthood, levels out for a period of time, and then generally starts to slowly decline as we age.
对于这些远古时期驯化牛骨骼的研究结果告诉了我们这些家畜宰杀时的年龄。
Study of the bones of these cattle from ancient times shows the ages at which the animals were killed.
对十几岁的孩子来说，上床睡觉的时间应该根据年龄而调整，就象婴儿时期一样。
Bedtime for a teenager should be age appropriate, just as it was when your child was a baby.
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