• 1. extend prolong: 延伸
• 2. stretch out extend prolong: 延伸
• 3. extend lengthen prolong extend: 指直线状的伸展 | 引申指扩大势力

• 1.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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