The forth stage negates its input.

第四个阶段对其输入求反。

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In the forth stage, the person realizes that the culture has good and bad things to offer.

第四阶段，人开始意识到文化有好和坏两个方面。

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Striding back and forth across the stage at the Yerba Buena Center, Jobs spoke passionately about the iPad 2's features as No. 2 and heir apparent Tim Cook looked on.

在芳草地艺术中心的舞台上，乔布斯跨步来回走动，激情四射的介绍iPad 2的特性，而做为苹果二号人物及绝对继任者的蒂姆·库克则在旁观看。

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N But it's definitely not one and in fact it wasn't N in the case of Selection Sort because remember the algorithm we implemented on stage last week had me going back and forth across the stage selecting on iteration, the smallest person I can find, the smallest number and then putting them into place.

但在选择排序中，肯定不会是1，也不是,注意，上周我们在这儿,实现的算法中，反复地,迭代进行选择，选出最小的数,然后将其放在合适的位置。

哈佛公开课 - 计算机科学课程节选

The camera is treated like an audience, with the actors simply marching back and forth on a stage.

CNN: 'Chasing Amy' excruciating, and not in a good way