All participants must follow the guidelines set down [=established] by the organization.所有参与人员都必须遵守组织方制定的规定。

Once she sets down the rules, there's no changing her mind.她一旦立下规矩，就不会改变。

She took out her notebook and started setting down her thoughts.她拿出笔记本，开始记下她的想法。

When an idea for a song comes to me, I set it down on paper.每当我有了写歌的灵感，我就把它记在纸上。

setting an agreement down in writing以文字形式把协议记录下来

We had to set the plane down in a field.我们不得不让飞机在一片田地里着陆。

I asked the taxi driver to set me down [=drop me off, (US) let me off] in front of the library.我叫出租车司机把我放在图书馆门口。