后来，其他研究人员测量了密度差，发现了一个显著的差异。
Later, other researchers measured the density differential and found a significant difference.
其他研究人员此前已经对这种细菌进行了改造，以从有机废物中产生酒精。
Other researchers had previously modified the bacterium to produce alcohol from organic waste.
其他研究人员抗议说，“选择退出”反应只是一种习得的或条件性的反应。
Other researchers protested that the opt-out response was simply a learned or conditioned response.
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