The Greek philosophers were obsessed with the chain of causality, how the cause of an effect should be traced back in a relay of hops until one reached the Prime Cause.

希腊哲学家痴迷于链式的因果关系，研究如何沿因果链条溯本追源，直至找到最初原因。

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Compare with the traditional control with the relay, the PLC control lowers the practice cost, enhances the teaching effect, and increases the study efficiency.

与传统的继电器控制比较，PLC控制降低了实习成本，增强了教学效果，提高了学习效率。

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The new type DC solid state relay is a kind of new contactless switching device, with the new type IGBT and power field effect tube as the core and composed completely by solid state electron devices.

新型直流固态继电器是一种以新型器件IGBT以及功率场效应管为核心的，全部由固态电子器件组成的新型无触点开关器件。

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