Note that the path must be a closed loop - that is, the first point of the first Edge object in the path must have the same location as the last point of the last Edge object.
注意，路径必须是一个闭环—也就是说，路径中第一个Edge对象的第一个点必须与最后一个Edge对象的最后一个点的位置相同。
Negative feedback loop — a closed path of action and reaction that self-limiting rather than self-reinforcing.
负反馈循环——在自我限制和自我增强的行为与反馈之间一条封闭的回路。
Feedback loop — a closed path that connects an action to effect on the surrounding conditions which, in turn, can influence further action.
反馈循环——在一个循环条件下连接行为和结果的封闭回路，依次的，能影响更多行为。
Positive feedback loop----A closed path of action and reaction that is self-reinforcing rather than self-limiting.
正反馈循环——在行为和反映之间一条为自我增加而非自我抑止的一条封闭回路。
When a light pulse is made to follow a closed loop path in real space, the phase of the returning beam might be slightly off from the phase of light starting off at that point.
当一个光脉冲在一个真实的空间里沿着一个封闭的圆环运动，当它回到出发点时，其相位与刚出发时的相位可能会有些微的不同。
When a light pulse is made to follow a closed loop path in real space, the phase of the returning beam might be slightly off from the phase of light starting off at that point.
当一个光脉冲在一个真实的空间里沿着一个封闭的圆环运动，当它回到出发点时，其相位与刚出发时的相位可能会有些微的不同。
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