延長的英文：
to extend; to prolong; to lengthen

extend是什么意思：
v. 延长；延伸；扩大；延续；伸，伸出
  • This will extend the life of the drive.
    这样会延长驱动装置的寿命。
  • Extended consciousness was his line.
    延展清醒意识是他的本行。
  • They extended their citizenship cautiously but steadily.
    他们慎重而稳步地扩大授与公民权的范围。
prolong是什么意思：
v. 延长，拖延，延期
  • Hospitalization may be prolonged.
    住院期可能延长。
  • addition or extension that prolongs sth
    增加或延长的部分.
  • Prolonged negotiation was not desirable.
    拖长了的谈判并不是大家所想要的。
lengthen是什么意思：
v. （使）延长
  • To save time is to lengthen life
    节约时间就是延长生命
  • As winter gave way to spring the days began to lengthen.
    冬去春来时，白天开始长了起来。
  • As winter gave way to spring the days began to lengthen
    冬去春来时，白天开始长了起来。

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