It was yeast and, later, flies and rodents that provided the first findings about caloric restriction, the intriguing hypothesis that a drastically reduced intake of calories can extend life span.

先是酵母，接着是苍蝇和啮齿类动物提供了有关热量限制的最初发现，激发了大大减少热量摄入可能延长寿命的假设。

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Optimism's benefits for physical health also extend beyond heart health, such as improved immune system function and increased life span.

乐观对身体健康的益处不仅限于心脏健康，还包括改善免疫系统功能和延长寿命。

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Flip your mattress and rotate it every three months to extend its life span.

把床垫翻过来并每三个月调换一次方向以延长使用周期。

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"The fundamental question is whether this treatment is actually going to extend the life span of these kids, " Kieran said.

CNN: Advances in kids' early aging disease

It would also extend the life span of import restrictions to ten years from five and grant the President the power to impose emergency restrictions on the importation of cultural artifacts from any country in the world, like Afghanistan, not just Unesco-convention parties.

FORBES: Collectors Guide

It would also extend the life span of import restrictions to ten years from five and grant the President the power to impose emergency restrictions on the importation of cultural artifacts from any country in the world, like Afghanistan, not just Unesco convention parties.

FORBES: Collectors Guide