从外部环境中导入的变量是在闭包函数定义的use子句中指定的。
Variables to be imported from the outside environment are specified in the use clause of the closure function definition.
如果碰巧该闭包函数跟某个事件绑定,那么就必须要解绑定。
If you happened to attach the closure to an event, then you would have to detach it from that event.
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。
The concepts of closures and lambda functions are definitely not new ones; they both come from the functional programming world.
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