Part of the power of Scala is that it encourages developers to create immutable objects by default.

Scala的一个强大之处就在于，它鼓励开发人员以默认方式创建不可改变的对象。

youdao

Anders Janmyr has a good overview of the new features including the ability to support non-extensible and immutable objects.

Anders Janmyr出色地概述了新功能，包括支持非扩展性和不可变对象的能力。

youdao

There can be no side effects on immutable objects, and caching a reference to an immutable object is always safe from alias problems.

不可变对象上没有副作用，并且缓存不可变对象的引用总是安全的，不会出现别名问题。

youdao

Different editions still had textual variations, introduced either intentionally as revisions or inadvertently through sloppy editing or typesetting, but books still came to be viewed, by writer and reader alike, as immutable objects.

WSJ: Nicholas Carr on E-Books