这些结果表明锗导带能谷不在布里渊区中心，且具有非球形对称等能面。
Our results indicate that the energy valley of conduction band of Ge is not lying in the center of Brillouin zone and the constant energy surface possesses non-spherical symmetry.
这一议案由英国首相布朗(Gordon Brown)提出，不过要获得美国等国家的同意，可能面临严峻的挑战。
The proposal was suggested by U.K. Prime Minister Gordon Brown, but could face a significant challenge in getting the U.S. and other nations to agree.
这里存在一个问题：推出年金的承保人有可能面临一些重大风险，比如投保人活得比预期长，或者金融市场长期陷入低迷等。
One problem: Annuities saddle insurers with potentially crippling risks like customers living longer than expected or the financial markets heading south for long periods.
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