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1·When facing difficulties, don't lose heart.

面对困难时，不要丧失信心。

2·Yet we need not lose heart over this bad habit.

然而，我们不必对这种坏习惯丧失信心。

3·Some people lose heart when they come across failures while others rise to the challenge.

一些人在面对失败之时灰心丧气而另一些人则迎接这一挑战。

4·He appealed to his countrymen not to lose heart.

他呼吁同胞们不要灰心丧气。《柯林斯英汉双解大词典》

5·No matter how hard your situation is, you had better not lose heart.

无论你的处境多么艰难，你最好都不要灰心。

6·Encouraged by his friends, Jack didn't lose heart and kept on trying.

在朋友们的鼓励下，杰克没有灰心，而是继续努力。

7·Whenever we are in trouble, we must never lose heart, but try to think of the way out.

每当我们遇到困难时，我们绝不能灰心，而是要努力想办法解决。

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

即使失败10次，我也不灰心。《新英汉大辞典》

9·This is not the time to lose heart.

因此现在还不是丧失信心的时候。

10·However, she did not lose heart.

然而她并没有丧失信心。