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。
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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