They also represent a part of a healthy environment that cannot be replaced.

VOA: special.2009.05.12

For example, if it's more convenient should you change the environment to make the unhealthy food less convenient and make healthy foods more convenient?

举例来说,如果是因为方便,那你改变外部环境,会使得健康食品比垃圾食品更容易获得吗

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Our immune system's function is to keep us healthy in the face of an environment where there are lots of things that could potentially harm us.

我们免疫系统的功能就是保持自身健康,在面对危机四伏的环境时,使我们免受伤害

耶鲁公开课 - 生物医学工程探索课程节选

In a normal, productive, healthy, happy environment, people don't scream at you about how bad you're doing but they compliment how good you are and that could lead to an inflated self-esteem on the part of people in certain domains.

在一个正常，高效，健康快乐的环境里，人们不会大声跟你说你做得有多差,但他们会称赞你做得很好,因而导致人们在某些方面,自我评价膨胀。

耶鲁公开课 - 心理学导论课程节选