会议开始前，我们先坐下来讨论一下议程。

Before the meeting starts, let's ___sit down and discuss the agenda.

我们需要开个会讨论这个项目的问题。

We need to have a ___sit-down to discuss the issues with this project.

孩子们在公园的长椅上坐下来吃冰淇淋。

The children ___sit down on the park bench to eat their ice cream.