The trees reach maximum yields at a relatively early age and maintain this level of production throughout their life span.

还在树龄相当小的时候，就可达到最高产量，而且在整个生命周期的，都能保持这种产量水平。

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And we should help them recover earlier and prolong their life span and improve their life quality through psychic concern and reasonable and balanced diet.

通过心理干预，合理调理膳食均衡，加强康复锻炼，以期达到延长寿命，提高生活质量的目的。

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Any microbes not captured in the forming powder are zapped by the secondary pulse, forcing them to spend their life span repairing call wall damage rather than reproducing.

那些没有隔离控制的微生物被二次电脉冲作用，迫使微生物在生命期内仅仅修补细胞壁而不是繁殖。

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They are RNA molecules but they have at some points in their life span, they have amino acids attached to them.

这些是如假包换的RNA分子,但在其生命周期的特定时间,它们会携带一个氨基酸分子

耶鲁公开课 - 生物医学工程探索课程节选

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Environmental campaigners have lost a legal battle to limit the life-span of a landfill site near their homes in Wrexham.

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