BBC Inside Science

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但在1993年藤森宪法中,这一概念未被明确定义。在政党碎片化与政治极化背景下,自2016年以来,它逐渐演变为国会弹劾总统的常规工具。条文未改,含义却已改变,这成为秘鲁制度危机的重要法律根源之一。

Not every modern human has the same set of Neanderthal DNA, however; different people will, by chance, have inherited different fragments. But there are also some areas, termed "Neanderthal deserts," where none of the Neanderthal DNA seems to have persisted. Notably, the largest Neanderthal desert is the entire X chromosome, raising questions about whether this reflects the evolutionary fitness of genes there or mating preferences.

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The German firm supplies about three-quarters of the bone cement needed in the NHS. The product is used in more than 1,000 operations a week, mostly in knee replacements, but also in some hip and shoulder replacements.