The critical velocity, or critical Froude number criterion has long been accepted as a means of determining frazil jam profiles.
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。
Ice jam flood: a lot of frazil ices and crushed ices gather under the covering ice, causing heading up of water level of upper reach.
冰塞洪水，大量冰花与碎冰在盖面冰下集聚，造成上游水位显著壅高的现象。
Later that afternoon I went to another lecture, about ice, in all its varieties: frazil, grease, brash, shuga, pancake, white, drift, rafting and fast.
就在那个下午稍晚的时候，我参加了另外一个讲座，是有关冰的，讲到了冰的所有变种：结块的、滑溜的、碎片的、松软的、扁平的、白色的、流动的、漂流的和坚固的。
Later that afternoon I went to another lecture, about ice, in all its varieties: frazil, grease, brash, shuga, pancake, white, drift, rafting and fast.
就在那个下午稍晚的时候，我参加了另外一个讲座，是有关冰的，讲到了冰的所有变种：结块的、滑溜的、碎片的、松软的、扁平的、白色的、流动的、漂流的和坚固的。
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