九个数字选三个有多少组合怎么算简介：It was not difficult for him to observe the treasure chest on a mountain peak 1,300 miles away. After the guard opened the box for just a moment, he could see clearly.
It was not difficult for him to observe the treasure chest on a mountain peak 1,300 miles away. After the guard opened the box for just a moment, he could see clearly.
