正如动物被岩石掩埋一样，这些病毒被困在其宿主的基因组里，而其自由生存的亲缘在不断地进化，它们实际上被时间冻结了。
Just as animals get buried in rock, these viruses become trapped in the genomes of their hosts. While their free-living relatives continue to evolve, fossil viruses are effectively frozen in time.
它们还急切地把现金握在手里，以防欧洲债务危机导致新一轮市场冻结。
They are also anxious to keep cash on hand in case Europe's debt troubles lead to a new market freeze.
核冬天的悲观论者，将他们的希望，一厢情愿地放在未经证实的核武器“冻结”、美国的单方面裁军、或者国际机构对核武器的控制之上。
Nuclear-winter doomsayers placed their hopes, variously, in an unverifiable nuclear-weapons “freeze, ” American unilateral disarmament, or assigning control of nuclear weapons to international bodies.
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