1、 Professor Stevenson, as an economist, how do you look upon the surging Chinese economy?
史蒂文森教授，作为一名经济学家，你如何看待中国经济的高速增长？
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2、 When Stevenson followed the carbon-14 trail back in time, he found carbon-4 levels change with the intensity of solar burning.
当史蒂文森跟随碳-14的痕迹来追溯过去时，他发现碳-4的水平随着太阳燃烧的强度而变化。
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