prolong
单词辨析：
多指在空间、时间、面积等方面延长或扩展。
Our summer vacation extended into September.
我们的暑假延至9月。
He wanted to extend his garden.
他想要扩建花园。
My farm extends as far as the river.
我的农场一直延伸到河边。
指在长度或时间上拉长或延长。
His trousers were lengthened.
他的裤子放长了。
Nights are lengthening with the coming of winter.
随着冬天的来临，夜晚渐渐变长了。
To save time is to lengthen life.
节省时间就是延长生命。
通常指时间上的延长，含超过正常限度之意。
He tried hard to prolong his mother's life.
他尽一切努力来延长母亲的生命。
The treaty has been prolonged for another 5 years.
这个条约又延长了5年。
相关例句：
The actual action of the drug can be prolonged significantly.
这种药物实际起作用的时间可以大大延长。
It's safe to eat foods that have been irradiated to prolong their shelf life.
食用经过辐射杀菌处理、延长了保质期的食品是安全的。
A long drawn out war would likely deepen and prolong the recession.
一场旷日持久的战争很可能会使衰退程度加剧，时间延长。
This study aims to investigate whether splenocytes can be used to maintain chimerism and to prolong graft survival.
这项研究旨在要研究脾细胞是否能够用于维持嵌合状态和延长移植物存活时间。
Will you prolong your anger through all generations?
你要将你的怒气延留到万代吗？
General treatment may prolong patient survival time, but not decrease the mortality.
综合性治疗使患者的生存时间延长，但不能降低病死率。