Happiness can fluctuate a lot , but an optimistic disposition is usually pretty stable .
幸福感可能会经常浮动,但是乐观的性情总是很稳定的。
We have hardly a trait , desire or disposition that is the same across all circumstances .
我们几乎没有哪种特质、欲望或性情在所有情况下都是相同的。
Not that surprising , to those of a shelleyesque disposition .
对于雪莱式性情的人,这没有什么奇怪的。
It is also a popular hobby among those of a geeky disposition .
它也是一些性情古怪者的爱好所在。
The scientists speculate that one 's tendency to grin-an example of what psychologists call " thin slices " of behavior that can belie personal traits-reflects his or her underlying emotional disposition .