Scientists aren't sure what is causing such extreme increases in nearsightedness, though they believe environmental factors are likely the culprit.
科学家们不确定是什么原因导致近视人数剧增，但他们认为环境因素可能是罪魁祸首。
Scientists aren't sure what is causing such extreme increases in nearsightedness, though they believe environmental factors are likely the culprit.
科学家们不确定是什么原因导致近视人数剧增，但他们认为环境因素可能是罪魁祸首。
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