"Blue ball" in Engpsh is usually referred to as "blue ball" or "blue sphere". It does not have a specific origin or cultural meaning, and is simply a common noun used to describe a round object that is blue in color.

Here are some examples of how "blue ball" might be used in Engpsh sentences:

The children were playing with a blue ball in the park.
The blue ball bounced off the wall and rolled away.
The art exhibit featured a large blue ball made of glass.

In Chinese:

孩子们在公园里玩蓝球。
蓝球从墙上弹了下来，滚走了。
艺术展览上有一个大的蓝色玻璃球。