That still leaves one outstanding thorny question: whether the modern trend to stick private Banks together with riskier investment Banks and hedge funds still makes sense.
还有一个非常棘手的问题：现在这种把私人银行与高风险的投资银行和对冲基金合为一体的趋势是否合理。
One big question for sleep researchers is why do animals sleep at all when it leaves them vulnerable to predators?
研究者们还有一个大问题，就是为什么动物都要睡眠，明知道睡眠会使自己失去警觉从而陷入被捕的困境。
'it leaves a question mark on China's operational know-how,' said an executive with one of the four foreign companies that sold China high-speed technology several years ago.
多年前向中国出售高铁技术的四家外国公司之一的一位高管说，故障令人质疑中国经营高铁的专业技术。
'it leaves a question mark on China's operational know-how,' said an executive with one of the four foreign companies that sold China high-speed technology several years ago.
多年前向中国出售高铁技术的四家外国公司之一的一位高管说，故障令人质疑中国经营高铁的专业技术。
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