不一定的英文：
not necessarily
maybe
not sure
uncertain

参考例句：
  • All are not friends that speak us fair.
    对我们说好话的人不一定都是朋友。
  • The time at which the two reductive divisions occur is not necessarily coincident to the time of ovulation.
    两次减数分裂的时间不一定与排卵时间相一致。
  • Dietary fiber is not necessarily fibrous in nature.
    膳食纤维在本质上不一定必须是纤维状的
  • An inattentive pupil is unnecessarily an unclever boy or a girl.
    不专心的学生不一定就是一个不聪明的孩子。
  • To disagree, one doesn’t have to be disagreeable. ——Barry M. Goldwater
    抗议不一定得动肝火。——戈德华特
  • In the fully plastic condition, the neutral axis does not necessarily pass through the centroid
    在全塑状态下，中性轴不一定需要通过形心。
  • not forever
    不一定
  • Not necessarily; not definitely
    不一定;不见得
  • The converse is not necessarily true.
    反过来就不一定正确。
  • All that glitters is not gold
    闪光的不一定都是金子
necessarily是什么意思：
adv. 必然；必定
  • The converse is not necessarily true.
    反过来就不一定正确。
  • Asian values are not necessarily authoritarian.
    亚洲价值观并不一定是权力主义的。
  • Yet that is not necessarily a reason for cynicism.
    但这不足以成为犬儒主义的借口。

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