这句话是说这个研究持续了30年吗
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送交者: 克己明德 于 2009-12-03, 19:47:52:
回答: here 由 tinaliang 于 2009-12-03, 18:47:50:
A very large, 30-year study of just about everyone in Scandinavia shows no link between cellphone use and brain tumors, researchers reported on Thursday.
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