The feat is not just a parlour trick—it could help people visualise how light travels in the curved fabric of space.
2
窍门在于，不仅要指定目标的一个、甚至两个维度，还要了解如何帮助人们更好地实现目标。
The trick is not only to specify just one or even two dimensions of the objective, but also to understand how to help people better achieve the objective.
3
政府如何帮助人们保持健康，避免过早死亡？
How can governments help people conserve their health and avoid premature death?
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