小明对爸爸说：“爸爸我好冷啊”爸爸说：“站到墙角就不冷了”小明不明白，问：“为什么啊”爸爸说：“因为墙角有九十度啊”。
Xiao Ming said to his father, "Daddy, I'm so cold."
Dad said, "you won't be cold if you stand by the corner."
Xiao Ming didn't understand, and asked, "Why?" Dad said, "Because the corner is 90 degrees."
