在窗口顶部以不同速度下落一些字母,击键,当所击之键是某个下落的字母,则字母消失,计分.字下落至窗口底部时,也消失,但不计分.字母消失后,重新生成新字母.-In the top of the window to the whereabouts of some of the letters at different speeds, keystrokes, hit the button when the letter was a drop, then the letters disappeared,