For example, the ArrayList class should have been defined with a first and last method, but alas it did not. However, it's easy enough to add those methods in Groovy, as shown in Listing 5.

举例来说，应该使用first和last方法来定义arraylist类，不过并未采用这种方式。

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First, if you choose good names for the method arguments, then your calls to those methods document each argument with a name.

第一，如果你为方法参数选择了好的名字，那么你对那些函数的调用事实上为每一个参数记载了一个名字。

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Method chaining USES return values from methods to relay instruction context, which in this case is the object instance making the first method invocation.

方法链接使用方法的返回值来中转指令上下文，在这种情况下是进行第一个方法调用的对象实例。

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