To nail down the potential environmental influences, researchers focused on the classroom.

为了明确可能存在的环境影响，研究人员将研究重点放在了教室这个特殊场所上。

Together these genetic and environmental influences might lead to the body not killing off immune cells that target myelin.

基因和环境因素的共同影响可能导致机体不能清除掉那些攻击髓鞘的免疫细胞。

Of course, our brains can decline as we grow older for lots of reasons-including other environmental influences or genetic factors.

当然，随着年龄的增长， 我们的大脑会衰退， 原因有很多——包括其他环境影响或遗传因素。

While lifespan is determined by factors such as genetics and environmental influences, health span can be influenced by various lifestyle choices and behaviors.

虽然寿命是由遗传和环境影响等因素决定的，但健康寿命可能会受到各种生活方式选择和行为的影响。

This goes against the notion most people hold that as we age, environmental influences gradually overpower the genetic legacy we are born with and may have implications for education.

这与大多数人认为随着年龄增长，环境影响逐渐压倒我们与生俱来的遗传遗产并可能对教育产生影响的观念背道而驰。

Twin studies are a natural model for looking at genetic and environmental influences on behavior, and what we are finding is that many more behaviors than we ever would have thought, do have a genetic component to them.

双胞胎研究是研究基因和环境对行为影响的自然模式，我们发现，比我们想象的更多的行为都受基因影响。

A multitude of factors, both inherited and environmental, influence the development of health-related behaviors, and it is beyond the scope of this text to discuss all these factors as they may affect any given individual.

包括遗传和环境在内的许多因素都影响着与健康有关的行为的形成，讨论这些可能会对某个人造成影响的所有因素超出了本篇文章的范围。