4 sentences

1. 他们怎么能够不失望？

   tā​men zěn​me néng​gòu bù shī wàng?

   How could they fail to be disappointed?

   Source: United Nations

2. 我们怎么能不失望呢？

   wǒ​men zěn​me néng bù shī wàng ne?

   How could we not be disappointed?

   Source: AI Challenger 2017

3. 我一点都不失望。

   wǒ yī​diǎn dōu bù shī wàng.

   I'm not disappointed at all.

   Source: OpenSubtitles

4. 使用尽可能少的词而不失去其意义。

   shǐ​yòng jǐn​kě​néng shǎo de cí ér bù shī​qù qí yì​yì.

   Use as few words as possible without losing the meaning.

   Source: CCMatrix