immutable

adj.

不可改变的；

1. If the data is immutable, it may be practical to allow it to be de-normalized.
   假如数据是不可变的，那么允许它不规格化是很实际的。
2. In summary, data that is distributed must be both immutable and stable.
   总之，分布式的数据就必须是不可变的，稳定的。
3. The permanent and the immutable are persistent.
   永恒不变的事物依然存在。
4. If the data is immutable, it may be practical to allow it to be de-normalized.
   假如数据是不可变的，那么允许它不规格化是很实际的。

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