哈勃望远镜的工作寿命一而再地得到了延长，航天飞机宇航员也完成了5次维修任务。他们不仅修复了出故障的元件，而且为仪器升了级，给仪表更换了电池。

Hubble's life has been extended time and again through five servicing missions in which space shuttle astronauts have fixed faulty components, upgraded instrumentation and replaced batteries.

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Christensen和他的同事认为，缩短每周工作时间还有助于提高人的健康水平，延长人的寿命。

Shorter working weeks might further increase health and life expectancy, Christensen and colleagues write.

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应具有较高的抗乳化性和良好的剪切稳定性，以利于与延长工作寿命。

Should have the high resistance to emulsion and the good shear stability, favors with the extension working life.

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