lose heart
丧失勇气, 失去信心
例句与用法：
No matter what you do, never lose heart.
不管你做什么千万不可泄气。
He failed many times, but he did not lost heart.
他失败了许多次，但他并没有失去信心。
Difficulties were increasing. Even then we did not lose heart.
尽管困难在增加，但我们毫不灰心。
He fail many times, but he do not lose heart.
他失败了许多次，但他并没有失去信心。
丧失信心
Don't lose heart.
别泄气。