If you were writing a pool game you could use a PickRaySegment to represent the pool cue and you could pick with BoundingSphere to detecting collisions between the balls.
如果你正在编写一个撞球游戏，你可以使用PickRaySegment表示撞球杆并使用BoundingSphere拣选以检查球与球之间的碰撞。
Gus stood at the table, toying with a cue stick, his eyes straying lazily over the billiard balls scattered about the table in the array of an unfinished game.
格斯站在桌旁，手里拿着一根弹球棒弄着玩，两眼懒洋洋地瞟着因一局未完而散在桌上各处的弹球。
Game Description: Our lost hero is out with his best buddy Blue ball. Together, the two balls manage to lose a treasure on an island. Can you help them reclaim their riches?
游戏描述：两个小球来到孤岛，寻找他们失散的伙伴，你能帮他们找到宝藏吗？
Think of life as a game in which you are playing with five balls in…
把生活看做一场游戏，在这场游戏中你将与五个悬在空中的气球一起玩。
If you only have to stop balls twice in a game, you must do it, so I'm happy with the save at the end, but that's my job.
如果你一场比赛只需要扑两个球，那你就必须做到。所以我很满意比赛结束前的扑救，但这正是我的工作。
Game Description: Combine two fluffy balls of a kind by hitting them with the white shell.
游戏描述：用白球，使两个颜色相同的毛球碰在一起。
Game Description: Combine two fluffy balls of a kind by hitting them with the white shell.
游戏描述：用白球，使两个颜色相同的毛球碰在一起。
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