大多数控制系统属于“闭环式”范畴。
Most control system fall in the "closed-loop" classification .
绝大多数控制论的研究停留在本书述及的水平：不切实际地拼织一幅宏大的画卷。
Most of the work in cybernetics was at the level of the book you are now reading: armchair attempts to weave a coherent big picture together.
就像其他大多数控制面临的状况，这里有一个平衡点，实践是验证真理的唯一标准。
Like many other control situations, there is a trade off and the only way to really tweak it is to experiment.
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