room可数还是不可数

There's room for three people in the back.

后排有可容三人的空位。

There's room for three people in back.

后排有可容三人的空位。

There is still room for improvement in your work.

你的'工作尚有改进的余地。

There's room for one more at the table.

这张桌子还有一个人的位置。

There was room for 20 people at the outside.

最多只能容纳20个人。