—— 请按键盘 空白键 开始游戏 ——

如果物体处于静止状态或作匀速直线运动,只要没有外力作用,物体将保持静止状态或匀速直线运动状态。
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
The most powerful art is often the most humble.