The various things that are iterators or iterator-like sometimes act sequence-like, but other times do not; conversely, sequences often act iterator-like, but not always.

迭代器或类迭代器有时表现得像序列，但有时候不是；反过来说，序列常常表现得像迭代器，但并非总是如此。

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Suppose instead, I want a machine that can take a recipe, the description of a sequence of steps, take that as its input, and then that machine will now act like what is described in that recipe.

假设换成这个，我想要一台可以安装描述，一系列步骤的结果的方法的机器，把那个当做输入设备，然后那台机器可以像方法中,描述的那样运行了。

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This would change when the virus crossed paths with cells containing a very specific DNA sequence, a sequence that would act as a molecular key to unlock secondary functions that were not so benign.

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Sliding panels may act differently at different points in the opening sequence.

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The track itself is a sequence of closely packed rectangular metal frames, each of which can act as an independent electrical circuit.

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