1.词汇

• delegate type 委托类型
• delegate instance 委托实例
• invoke 调用

2.例句

• We’ll start our tour of delegates with the four absolute basics, without which none of the rest would make sense.

  在开始我们的委托之旅之前，我们需要先了解4个基本条件，它们缺一不可。

• In order for a delegate to do anything, four things need to happen:
  (1)The delegate type needs to be declared.
  (2) The code to be executed must be contained in a method.
  (3) A delegate instance must be created.
  (4) The delegate instance must be invoked.

  要实现委托，需要做4件事：
  （1）委托类型需要先声明；
  （2）要执行的代码需要包含在一个方法内；
  （3）需要创建委托实例；
  （4）委托实例需要被调用。