你需要涂一层油漆以防止金属生锈。

You need to apply a coat of paint to prevent the metal from rusting.

这门急需刷一层油漆。

The door badly needs a coat of paint.

就像他们在上面涂了一层油漆。

Like they put a coat of paint on it.

给墙上加一层油漆。

Add a layer of paint to the wall.

第二层油漆是多余的，因为第一层已经足够了。

The second coat of paint was redundant as the first one was sufficient.

他们刚刷了第一层油漆。

They only painted the first layer fo poaint.

新刷的一层油漆可使房间焕然一新.

A fresh coat of paint can transform a room.

新涂的一层油漆可以使房间焕然一新.

A fresh coat of paint can transform a room beyond recognition.

这个是最长的一段栏杆，正在等上第一层油漆呢。

The longest part was finished and was waiting for painting.