如果机器到了节点2处，那么这个节点处的交互将一直重复自身，直到它完全满足预置条件才转到最后的节点，即节点5处来实现另一个交互流。
If the machine gets to node 2, the interaction at this node repeats itself until it fully meets a preset condition and then goes to the final node, node 5, to implement another interaction flow.
bash中的while循环可以重复执行语句一定的次数，或者一直执行到满足某一条件为止。
A while loop within bash allows you to execute a statement a given number of times, or until a certain condition is met.
在中国农村，二胎一直都能得到许可，但是这也是需要满足一定特定条件的，比如第一胎须为女孩，诸如此类。
These have long allowed those living in the countryside to have two children under certain conditions—if the first child is a girl, for example.
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