"take up"作为不及物动词时，通常表示“开始从事某项活动”或“占据空间或时间”。以下是一些不及物动词的例句：

1. She took up painting as a hobby.

2. The book takes up too much space on the shelf.

3. They took up arms and fought for their beliefs.

4. Take up a cup of tea.

5. He took up his position at the meeting.

希望这些例句能帮助你理解"take up"作为不及物动词的用法。