这两项因素一直都是互相影响的，这就是为什么难受的时候微笑会使你开心些，同样也说明了为什么当发现有趣的事情时你会大笑。
All the time these two factors affect each other, that is why smiling when sad makes you happier and it is why you laugh when you find something funny.
如果电流和电压变动，其它因素开始作用，因为电流和电压是互相影响的。(译者注：其它因素？)
If current and voltage are fluctuating, however, other factors come into play, as the current and voltage interact with each other.
通过整个这些过程，你的一个目标是建立研究人员称之为“你个人事务的思维模式”——各种因素组合与互相影响的图画。
Through the whole process, one of your goals is to build what the researchers call "mental models of your business" - pictures of how the elements fit together and influence one another.
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