No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.

历史上有过不同的习惯，这里我们规定,如果环境对系统做功。

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Because they were used to living in different times.

因为他们习惯住在不同的时代。

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And when I talk on Wednesday about developmental psychology I'll show different ways in which psychologists have used habituation to study the minds of young babies.

等我们在周三探讨发展心理学时,我会向大家讲述心理学家们,应用习惯化,来研究婴儿心理的不同的方法。

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