制成品物质成分减少：指在制造品中劳务的内容不断增加的现象。
Dematerialization of manufactures: the phenomenon whereby the service content of manufactured goods is increasing.
蒸汽发生器水位控制系统是非线性、时变的多变量系统，“虚假液位”现象的存在使蒸汽发生器液位控制成为一个难题。
Steam generator level is a non-linear, mutative and multi-variable system. It is a problem to design the control system because of "false level".
基于缝隙对声发射波传播有影响的现象，作者研制成一种利用声发射- 微处理器控制的焊缝跟踪系统。
Based upon the influence of a gap on the propagation of the acoustic emission waves, thedesigning of the weld seam tracking system with an acoustic-emission-microcontroller is described.
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