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 lose heart 

If you lose heart, you start to feel that you will not be able to succeed with something.

如果你lose heart，那么就是說你開始覺得你將無法做成某事。

Although he failed in this examination, he didn't lose heart. 

 這次考試他雖名落孫山，但他并不氣餒。

I'll never lose heart even if I should fail ten times.  

即使失敗10次，我也不灰心。