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。
The context being relayed via the method chaining is this, meaning that you can make a series of method calls concisely.
通过方法链接中转的上下文是this，这意味着，您可以精确地进行一系列方法调用。
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