If it is possible to spot excessive lending as the market climbs, how can it be so impossible to identify bubbles?

如果在市场繁荣时发现过度借贷是可能的，为什么确认泡沫就变得不可能呢？

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Even when it is impossible to achieve true molecular specificity, it may be possible to aim light precisely at defined cells.

甚至当获取确凿的分子特异性希望渺茫的时候，它都能够准确的用光勾画出细胞的轮廓。

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It is impossible to anticipate all the possible ways in which regulations can be evaded.

但是不可能预防所有规则可以被逃避的路径。

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But until it's possible to know how big that liability is, it is impossible to judge the impact on Merck--and on other big drug companies.

FORBES: Behind Merck's Fall

It is possible to earn a profit and be responsible, but it is nearly impossible to do both perfectly.

FORBES: BP Under Fire: Profit Versus Responsibility

It is impossible to anticipate all the possible ways in which regulations can be evaded.

ECONOMIST: World economy