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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。

气馁

1·Though the city suffers a great damage, the people there don't lose heart.

虽然这个城市遭到了重大损失，但是那里的人们并不气馁。

2·Whenever you meet with difficulties in your English studies, you should not lose heart but try to overcome them.

无论何时在英语学习中遇到困难，都不可以气馁，而应该努力去克服。

3·Hearing what the manager said, William didn't lose heart and determined to practice the smile.

听了经理的话，威廉没有气馁，立志苦练笑脸。

4·When days are covered by haze, one should not lose heart. So long as one has faith in life, can he free himself from haze and welcome the bright sunshine.

阴霾笼罩的日子，不要气馁，只要对生活充满信心，就能走出阴霾，迎来明朗的阳光。

泄气

1·I know it's difficult to find a job now, but don't lose heart.

我知道现在很难找到工作，但别泄气啊！

2·Its my mother who has been encouraging me never to lose heart when I had difficulties in study.

这些年来，当我在学习中遇到困难时，是我的母亲一直在鼓励我从不要泄气。

3·Long life, can't smooth, this is the time to test you, don't lose heart, we believe you, support you forever!

漫长的人生路，不能够一帆风顺，这正是考验你的时候，不要泄气，我们永远相信你、支持你！

4·After 24 hours had passed and there was still no news of the missing plane, we began to lose heart.

飞机在失踪二十四个小时后仍无任何消息，我们开始感到泄气。