Cancer cells squeezed by the tiniest veins transform into a different type of cell capable of forming new tumors, a potential trigger for metastasis, the fatal spread of cancer to other body parts, ...

8月20日，《自然》（Nature）发表题为《南极环境急剧变化的新证据》（Emerging Evidence of Abrupt Changes in the Antarctic Environment）的文章指出，南极环境正在经历急剧变化，包括海冰覆盖面积急剧减少、冰盖与冰架稳定性减弱，以及部分海洋与陆地物种数量下降。

SYDNEY, Sept. 8 (Xinhua) -- Australian scientists have successfully made the first-ever release of captively reared mountain frogs into the wild to save the critically endangered species from ...