The civil rights leader, who ran for president twice in the 1980s, leaves a lasting legacy.
Six pregnant women participated in a small trial in which placenta-derived stem cells were applied to fetal spinal cords and the treatment was found to be safe.
，更多细节参见同城约会
与 Kindle 的反射式墨水屏不同，智能手机的屏幕本身就是光源。
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