两种处理方法下的壳体δ13C 变化均不稳定，可能是受生物个体本身“生命效应”(Vital effect)的影响[21]；壳体δ18O 在软体动物生长过程中易于与湖水达到同位素平衡[22]，同一层位δ18O 的变化应该表现出较好的一致性，然而...
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在实验动物身上显示出明确的延长生命效应的唯一实验是使大小老鼠们遵循严格限制的饮食。
The only experiments on laboratory animals that have definitely shown a life-lengthening effect have involved subjecting rats and mice to a severely restricted diet.
不难解释，消防员效应的存在，因为他们都是典型的体格健壮型男子，而且总是面对极大的身体风险，需要去拯救陌生人的生命。
It is not difficult to explain why such a "fireman" effect might exist. They are typically athletic men who face great physical risks, as a means of saving strangers' lives.
如果没有这种“温室效应”，地球将变得非常寒冷，而不适于生命的存在。 但过度的温室效应导致了现在金星上所见的地狱般的景象。
Without this so-called " greenhouse effect, " Earth would probably be too cold for life to exist, although a runaway greenhouse effect led to the hellish conditions now seen on Venus.
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