作文通知留学生写作指南：

标题：

使用粗体字居中，例如“Notice”。

日期：

在标题下一行，右对齐，格式为月日，年，例如“December 21, 2019”。

正文：

首行缩进四个字母，正文内容应简洁明了，传达必要信息。

署名：

在通知的最后一行，右对齐。

通知内容要点：

欢迎留学生参加即将到来的歌唱比赛。

提供比赛的相关信息，如时间、地点、参与方式等。

鼓励留学生积极参与，丰富校园生活。

范例：

```

Notice

December 21, 2019

We are excited to announce that our school will be hosting a singing competition! This event is designed to enrich our campus life and provide a colorful experience for all students.

The competition will take place on [Insert Date and Time Here]. Students are encouraged to participate and showcase their talents. For more details, please refer to the attached poster or visit the Student Union office.

We look forward to seeing your performances!

Sincerely,

[Your Name or Student Union Representative]

```

请根据具体情况调整上述模板中的内容和格式。