约翰-卡罗尔(John Carroll)，前NCAA主教练，前NBA波士顿凯尔特人队主教练。卡罗尔在2003-04赛季后半程接替离职的吉姆-奥布莱恩（Jim O'Brien）暂代波士顿凯尔特人队主教练，赛季结束后，道格-里弗斯(Doc Rivers)接替其凯尔特人主教练职位。
在格拉斯哥市中心，车主约翰·安德森和他的同事卡罗尔·劳伦斯回到那辆价值3.5万英镑的车时，他们震惊地发现车旁边站着两名警察。
When the car's owner John Anderson and his colleague Carol Lawrence returned to the car—which was itself worth £35, 000—in Glasgow city center, they were shocked to find two policemen standing next to it.
加德纳把卡罗尔的算法告诉了他的朋友约翰·康威，并要求康威给出一个更简单的。
Gardner then told his friend, John Horton Conway, about Carroll's algorithm and challenged Conway to come up with a simpler one.
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