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If you lose heart, you start to feel that you will not be able to succeed with something.
如果你lose heart，那么就是说你开始觉得你将无法做成某事。
Although he failed in this examination, he didn't lose heart.
这次考试他虽名落孙山，但他并不气馁。
I'll never lose heart even if I should fail ten times.
即使失败10次，我也不灰心。