lose heart中文翻译为失去信心；灰心；泄气。
双语例句
1、He appealed to his countrymen not to lose heart.
他呼吁自己的同胞不要丧失信心。
《柯林斯高阶英汉双解学习词典》
2、The young technical innovator didn't lose heart despite several failures.
这位年轻的技术创新者并没有因为几次失败而灰心。
《外研社英语同义词辨析词典》
3、I'll never lose heart even if I should fail ten times.
即使失败10次，我也不灰心。
《汉英大词典》
4、Although he failed in this entrance examination, he didn't lose heart.
这次入学考试他虽名落孙山，但他并不气馁。
《汉英大词典》
5、Don't lose heart!
别泄气！
《汉英大词典》
6Even though your research appears to be at a dead end now, you shouldn't lose heart but keep on trying.
即使你们的研究现在似乎没有什么进展，你们还是不应该泄气，而要继续进行下去。
百度翻译例句库
7、When facing difficulties, don't lose heart.
面对困难时,不要灰心。
中考真题- 2018 哈尔滨 完形填空
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