01 构建游戏对象实用程序类(01 Build a gameobject utility class)
02 循环游戏对象(02 Recycle game objects)
03 构建对象池(03 Build an object pool)
04 将对象池连接起来(04 Wire up the object pool)
05 使障碍再循环(05 Make obstacles recyclable)
06 在任何脚本中实现循环(06 Implement recycle in any script)
07 清除障碍物(07 Clean up the obstacles)
08 动态调整大小2D盒对撞机(08 Dynamically resize 2D box colliders)