See a pin and pick it up, all the day you have good luck.这句话为什么对?不是have a good luck吗?

题目

See a pin and pick it up, all the day you have good luck.这句话为什么对?不是have a good luck吗?

答案

have a nice day 可以.day 是可以数的.
have good luck ,wish you good luck,good luck to you 都没有 a