它也可以解答许多古老的问题，例如暗物质是什么，时间为什么只按一个方向流动，引力是怎样运行的。
It would also answer such enduring puzzles as what dark matter is, the reason time flows in only one direction and how gravity works.
例如，将干细胞置于流动的流体中，它们就能生成血管。
Expose stem cells to flowing fluid, for instance, and they turn into blood vessels.
例如，SARS使我们了解到我们具有高度流动性、相互联系和相互依赖的世界在对健康威胁的脆弱性方面有了多大的变化。
SARS, for example, taught us how much our highly mobile, interconnected, and interdependent world has changed in terms of its vulnerability to health threats.
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