a polka-dot tie的用法和样例：
- She was wearing a little white dress with red polka dots.
- It was an Itsy Bitsy Teenie Weenie yellow polka dot bikinithat she wore for the first time today.
- Wool cardigan paired with polka dot socks from Sockdreams and mustard vintage pumps.
- I borrowed my friend's polka dot galoshes, but at this point in the tunnel the water was well above them.
- Well, I think you look very pretty in your polka dot purple dress with your hair piled at the rear. That makes you very graceful and mysterious.