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What's more, unlike with house construction, a wall in life might have been built to be decorative and only become load-bearing over time. Perhaps you threw a party on a whim and then did so again the following year. Soon enough, it's a tradition. Friends look forward to it every year. You do too. However, as more and more people lean on that wall, it will either strengthen to bear the load or it will collapse. Eventually, our lives are constructed entirely of walls which were never built to carry the loads they have upon them, and it's when these walls collapse that their consequences reverberate farther than we might imagine.，这一点在谷歌中也有详细论述
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Zhao's faculty supervisor, K.T. Ramesh, said his interest in the problem grew out of involvement in a National Academies study that asked whether microbes could move from Mars to one of its close potato-shaped moons, Phobos.