The link has been made by several highly authoritative studies, both by leading American scientists.
美国顶尖科学家们进行的一些很有权威的研究已经确立了这个联系。
That conclusion was bolstered by several other studies this year.
这个结论被今年的许多其它研究所支持。
That conclusion was bolstered by several other studies this year.
这个结论被今年的许多其它研究所支持。
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