For many years researchers had been spurred on by an apparent paradox: that rising incomes did not make people happier in the long run.
多年以来，研究人员都无法解释这个明显的悖论：从长远来看，收入增加并不能使人过得更幸福。
Come to think of it, the slogan "women are as good as men" has spurred women on to achievements to challenge men's. But at the same time, women must still do what men do not stoop to.
仔细想想，“男女都一样”的口号曾鼓舞着许多妇女竭力地建树和男人一样的丰功伟绩，同时，女人却依然要做那些和男人不一样的事。
In his own work, he's even speculated that similar tectonic challenges, and not just factors such as climate change, could have spurred the evolution of humans in Africa.
在他的研究中，他甚至推测类似地质变动的挑战，以及气候变动之类的因素也许刺激了人类在非洲的进化。
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