我们的软件工具通常是沉默的, 我们能听到的只有静静敲击键盘的声音.Our software tools are mostly silent; all we hear is the quiet click of the keyboard.键盘的90个键必须组成9×10的矩阵.The 90 keys of the keyboard must be organized as a 9 by 10 matrix.至于光盘, 则是在键盘的左方.Op...