The concepts of closures and lambda functions are definitely not new ones; they both come from the functional programming world.
闭包函数和 lambda 函数绝对不是新出现的概念；它们均来自函数编程领域。
NET 3.5 programming: from decision trees to data structures, from exceptions to lambda expressions, and from objects to components.
NET 3.5编程：从决策树的数据结构，从lambda表达式的例外情况，从对象到组件。
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