Ah, right.  So the bladder, or the skin of the bed is the bladder, which is a sort of a plastic bag for holding water, which is on the top of the mattress.  And the mattress is on the bottom.
assitant
Are you saying it is some kind of container?  Are you saying it is a ship of water?
assistant
How do I deflate a water bed?
user
I am not familiar with this thing you are referring to. I only know of water.  And I know some things about it.  Can you describe what it looks like?
assistant
It is a bed mattress full of water.
user
Alright.  So it’s full of water.  So it’s a large amount of water.  It is also round.  And it is a bed.  Alright.  I think this is a similar concept as a ship in the sea.
assistant
It is a big water bladder for a mattress.
user