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某一类群生物在其大规模繁盛之前就已经出现的少数代表。生命宏演化进程中分类单元的一种形式,它们往往拥有特殊的演化新质,能够突破重大灾变的冲击而幸存下来并进一步发展、壮大。
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safety of concentrators
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