disillusion

disillusion
[ˌdɪsɪˈl(j)uːʒ(ə)n]
noun
  1. [mass noun]disappointment resulting from the discovery that something is not as good as one believed it to be
    幻灭,失望
verb
  1. [with obj.]cause (someone) to realize that a belief they hold is false
    使信念破灭
    if they think we have a magic formula to solve the problem, don't disillusion them.
    如果他们认为我们有可以解决问题的神奇方案,别使他们失望。
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