3 sentences

1. 写注释是为了帮助读者理解代码。

   xiě zhù​shì shì wèi​le bāng​zhù dú​zhě lǐ​jiě dài​mǎ.

   The purpose of comments is to help readers understand the code.

   Source: CCMatrix

2. 如果注释很短，结尾的句号可以省略。

   rú​guǒ zhù​shì hěn duǎn, jié​wěi de jù​hào kě​yǐ shěng​lüè.

   If a comment is short, the period at the end can be omitted.

   Source: CCMatrix

3. 有些程序甚至允许您注释每个步骤，并告诉人们需要做什么。

   yǒu​xiē chéng​xù shèn​zhì yǔn​xǔ nín zhù​shì měi​gè bù​zhòu, bìng gào​sù rén​men xū​yào zuò shén​me.

   Some programs even allow you to annotate each step and tell people what needs to be done.

   Source: CCMatrix