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。
2
From the beginning, your instruction in this series of lessons will be on object-based concepts.
从现在开始这一系类课程将教导基于对象的概念。
3
If the glove's wearer closes his fist, the robot takes that as an instruction to grip an object with its arms.