moving the car forward by pressing up arrow key, and down arrow key is for backward direction. The moving direction is controlled by your mouse cursor. The goal is to reach the bold black line. 按向上箭頭鍵使汽車向前移動，向下箭頭鍵用於向後移動。移動方向由鼠標控制。 目標是碰到黑線。
