在实际和经济上允许清洁任何的表面，甚至几乎接触不到的地方，并且不需要任何化学产品。
Steam allows to practically and economically clean any surface, even hardly reachable, with no chemical product demanded.
在分析和设计继电器-接触器控制电路时，往往忽视临界竞争现象，结果造成电气控制达不到预期目的，甚至造成事故。
In the practice of analyzing and designing of relay-contactor circuits, the critical-competition phenomenon is usually ignored, causing failures in reaching the intended purpose or even damages.
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