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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At some point in its execution, the each method executes the yield instruction giving it an argument that happens to be the next element of the list in the case of the Array class's each method.

在执行中的某个时刻，each方法执行yield指令，在Array类的each方法的情况下，给该指令一个正巧成为列表中下一个元素的参数。

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Case method of instruction and task-based approach are in accordance with the requirement of BEC teaching goal, for they could improve English application capacity in concrete business environment.

案例教学法和任务教学法符合剑桥商务英语教学目标的要求，能切实提高学生在具体的商务环境中实际运用英语语言的能力。

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