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Dioxin is the most toxic man made substance known to science.
二恶英是目前科学上已知的最毒的人造物质。
youdao
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Diamond is the hardest substance known.
钻石是已知物质中最硬者。
youdao
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This is the most dangerous substance known to man.
这是人类已知的最危险的物质。
youdao
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This is the most dangerous substance known to man.
这是人类已知的最危险的物质。
youdao