One of the great puzzles of human nature is why humans strive for more material things-money, job, homes, cars, flats-screen televisions-when they do not seem to make them any happier in the long run.

人性中最重要的一个谜题是为什么人类不停的奋斗争取到他们物质生活的东西，金钱，职业，家庭，车子，平面电视。但最后他们却没感觉到有什么快乐的。

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To this end, a tire changer that features a mechanical bead pusher for mounting and demounting low-profile tires, ultra-low profile tires and run-flats is a must.

对这一个结束，一个为架设以一个机械的珠子推者为特色的轮带变更者而且卸下低调的轮带，过度的-低点描绘轮带轮廓，而且奔跑-公寓是必须。

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The car manufacturer could have swapped out the one good tire for a pair of alternative run flats (which seem to be available).

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