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晚古生代早期的洋盆较狭窄，生存时间为数千万年。
The ocean basin became more narrow in early Late Paleozoic, which last several millions years.
youdao
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对于古生代dna的研究开始于20世纪80年代中期。
Ancient-DNA research began in the mid-1980s.
youdao
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对于古生代dna的研究开始于20世纪80年代中期。
Ancient-DNA research began in the mid-1980s.
youdao