America must counter the rigidities that have arisen after its asset bust .
美国则必须改革在资产泡沫后出现的僵化规定。
www.ecocn.org
Yet scientists do know that in every case of cancer , the entire menagerie of malignant cells has arisen from a single unstable mother cell .
不过科学家也知道，在每一个癌症病例中，整群的恶性细胞都来自单一个不稳定的母细胞。
edu1.wordpedia.com
Developments over the past decade , however , have given new credibility to the idea that Earth 's biosphere could have arisen from an extraterrestrial seed.
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