长期以来，人们一直用临界流速或临界佛汝德数的准则来确定冰塞的演变。
The critical velocity, or critical Froude number criterion has long been accepted as a means of determining frazil jam profiles.
在一定坡度不同流量条件下，道路坡面径流弗汝德数随径流历时增长而减小。
Froude number of slope runoff of road decreased with runoff duration under a certain slope and the different flow discharges.
顾汝德说，在这种情况下，最佳做法是确保在出现泡沫时，只有投机者受到伤害，银行系统不会受到伤害。
Under those circumstances, says Mr. Goodstadt, 'the best thing is to make sure if there is a bubble, the only people that get hurt are the speculators, not the banking system.
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