(look backward)尝试所有匹配可能，所以在最差的情况下会呈指数级时间复杂度。工程上为了优化解析的效率，引入了
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look forward look backward 回顾过去展望未来
A backward look 向后看 ; 内容回顾
同义词： look back
以上来源于: WordNet
Sometimes the best way to go forward is to look backward.
有的时候回顾是最好的前瞻。
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Thus he could look backward and forward at the same time.
他一直可以向前看，也同时向后看。
A holiday gives one a chance to look backward and forward, to rest oneself by an inner compass.
假期使你有机会反省与前瞻，用心中罗盘重新定好方位。
In the next months, Italy will not look backward or inwards.
BBC: Monti expects UK citizens to vote to stay in the EU
Yet companies rarely use analytics to plan for the future, as good as they may be at using its data to look backward to identify trends.
FORBES
We can look backward in time for guidance.
FORBES: Is Apple Becoming Microsoft?
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