* @param arr 待排序数组
儘管享受到了免於恐懼的自由，但日子過得並不容易，最拮据的時候，是蝸居在一處地下房內，靠著超市裡的冷凍食物度日。
，这一点在heLLoword翻译官方下载中也有详细论述
3. 数学之美：参数化几何体与克莱因瓶，推荐阅读Line官方版本下载获取更多信息
You might feel some relief with a fully split keyboard if you find yourself tensing up at the shoulders as you type on a standard board. Putting some distance between your hands may allow your chest to stay more open, which for some is an easier position to maintain. You may also appreciate being able to place your mouse or trackpad between the two halves of the board to minimize the distance your cursor hand needs to travel.
Tetrapal: A Palette Triangulator