The breakthrough is unlikely to lead to drugs that dramatically extend lifespan, but doctors say it may help prolong the lives of patients whose genes make them susceptible to dying young.

尽管这项突破不太可能带来大幅延长人类寿命的药物，但医生指出，这项研究也许有助于延长那些由于自身基因而更易早逝的病人的寿命。

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If need to extend the leave, the applicant should explain before the expiry date, and apply prolong leave with relevant certifications, or he will get "Absent Class" treatment.

第十一条膍需延长假期者，在请假期满以前说明理由，持有关证明申请续假，否则按旷课处理。

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But efforts by governments to extend and prolong unemployment benefits, and to offer more job counseling and training have not kept up with the rising numbers of jobless.

VOA: standard.2009.09.16