他已经安排了与一位制作人的会面，后者曾与美国的拉格泰姆八重奏（Ragtime Octette）合作演出。

He had arranged an appointment with a producer who was sending out a show with the American Ragtime Octette.

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皮尔斯还肩负了一个特殊的任务安排：将一块取自艾萨克.牛顿苹果树的树皮，带入零重力的太空中。

Stephen G. Bowen of the Navy, a former submariner, and Piers J. Sellers, a British-born astronaut who arranged to carry a piece of bark from Isaac Newton’s apple tree into the weightlessness of space.

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因此，要浏览这篇文章重的练习，创建两个用户并将其中一个安排为那些角色的每一个。

Therefore, to work through the exercises in this article, create two users and assign one of them to each of those roles.

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