A Riddle 谜语（中英双语）

A RIDDLE
谜语
In this white room
一间白屋子
We see no door
没有门进出，
We see no floor.
地板也没铺。
But this white room
可这白屋子
Has only one wall
只有一堵墙，
And in this white room
漂亮黄皮球
We see a nice yellow ball.

就在屋里藏。