Backwards navigation is improved by introducing the concept of Webflow, which is a named sequence of visited Web pages. In fact, the backward navigation is improved at two different levels.

通过引入Webflow的概念，即已访问web页面的有名序列，可改善后退导航。

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Some read the sequence backward, thus requiring bidirectional iterators.

一些算法反向读取序列，所以要求双向迭代器。

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By working backward through a decay sequence, the scientists are reasonably certain they created element 118, even though the highly unstable new atoms survived only a millisecond apiece.

通过回溯一个衰变序列，科学家们有理由确认他们创造了118号元素，即便这种高度不稳定的新元素仅仅存在了一毫秒。

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In one sequence, Cobb giggles as he watches a Japanese boy, no more than 10 years old, turn backward handsprings in the street.

WSJ: Ty Cobb: A Juicy Look At the Georgia Peach