Collection types for working with immutable data, including list and sequence types.
用于不可变数据的集合类型, 包括列表和序列类型.
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中国审美观随着时代的变迁不断地改变, 可是某些特质与特征却是永恒不变的.
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There are some class immutable is impossible, then try to limit the mutability of them.
而总有些类显然不可能是不变类的, 这时也要尽可能的限制它的可变性.
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It also acceptable to cache versioned data since each version is immutable.
既然每个版本的数据是不可变的,那么混存版本化数据也是可以接受的.
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