浴缸的下水道堵住了，我需要找人来疏通。

The bathtub drain is ___clogged, so I need to call someone to unblock it.

下水道堵住了，水流不下去。

The drain is ___clogged up and the water won't flow.

下水道堵住了，水流得很慢。

The drain is ___clogged up, so the water flows very slowly.