lambda表达式的基本原理是提供了一种将代码表达为数据的方式，从而可以将代码字面量传递至代码库中，以便在方便的时候随时调用。
The primary rationale for lambda expressions is to have a way to express code as data, so that code literals can be passed to libraries that will invoke them at convenient times.
lambda表达式的基本原理是提供了一种将代码表达为数据的方式，从而可以将代码字面量传递至代码库中，以便在方便的时候随时调用。
The primary rationale for lambda expressions is to have a way to express code as data, so that code literals can be passed to libraries that will invoke them at convenient times.
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