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But meanwhile time flies; it flies never to be regained.

  • -- Publius Vergilius Maro 维吉尔

但与此同时，时间飞逝;它再也飞不回来了。

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Heat can also be produced by the impact of imperfectly elastic bodies as well as by friction. This is the case, for instance, when we produce fire by striking flint against steel, or when an iron bar is worked for some time by powerful blows of the hammer.

不完全弹性体的冲击和摩擦也能产生热。这是一个例子，例如，当我们用燧石打钢而产生火的时候，或者当一根铁棒被锤子猛击了一段时间而产生火的时候。

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Don't use tap water to make your colloidal silver. Use pure distilled water only. And don't take very large dosages or strong concentrations for long periods of time.

不要用自来水来制造胶体银。只使用纯蒸馏水。也不要长时间服用大剂量或高浓度药物。

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