边走边拿着身后机器盒子是不容易的；
Walking while pulling the robot's box behind him wasn't easy;
这个机器老鼠和普通老鼠一样大，但看起来就像一个简易的带轮子的塑料盒子。
The robot was the same size as a regular rat but resembled a simple plastic box on wheels.
白盒子是可互相交换的，主应用程序可能把集群中的任何机器指派为控制者，而这个机器就把map和reduce任务分派给其它连接的白盒子。
White boxes are interchangeable, and the main application may assign any machine in the cluster as the controller, and this one in turn assigns map or reduce tasks to other connected white boxes.
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