如果前提为真，那么结论肯定为真，论点的有效性，保存了前提的真理。
If the premises are true then the conclusion must be true so the validity of the argument preserves the truth of the premises.
头发是一千多年来被人们发现的一种保存得最为完好的人类身体组织，真因为如此，对尸体头发的分析研究不仅可以阐明犯罪的方法，而且也可以用来研究古代的文明。
Hair is one of the best preserved human tissues found over the millennia, and as such, analyzing it can not only shed light on crimes, but also on ancient civilizations.
人生就算再失意亦要为自己保存一点天真，既然无法改变他人那就改变自己。
Even more frustrated life should also be preserved for their own a little naive, since we can not change others then change yourself.
她保存着莎士比亚的真本。
这绘画令人惊讶的是格外好的保存质量状态。但是，这种状态使别的专家们带来强烈的怀疑（真否性）。
The surprising quality and exceptionally well preserved state of the paintings caused the specialists to doubt whether they were genuine.
这绘画令人惊讶的是格外好的保存质量状态。但是，这种状态使别的专家们带来强烈的怀疑（真否性）。
The surprising quality and exceptionally well preserved state of the paintings caused the specialists to doubt whether they were genuine.
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