His progress in sequencing genes was causing consternation among many scientists and bioethicists.
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Bioethicists fretted about the risk such treatments posed for mothers and children.
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But some researchers and bioethicists say that's easier said than done.
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英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。