With the global need for basic sight-correction, by his own detailed research, estimated at more than half the world's population, Silver sees no reason to stop at a billion.
Silver自己的详细研究表明，全球有超过一半的人口需要基础视力纠正，所以他认为即使在达到了“十亿目标”后，他也不能止步不前。
With the global need for basic sight-correction, by his own detailed research, estimated at more than half the world's population, Silver sees no reason to stop at a billion.
Silver自己的详细研究表明，全球有超过一半的人口需要基础视力纠正，所以他认为即使在达到了“十亿目标”后，他也不能止步不前。
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