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对自然信号系统或人造信号系统特性的科学研究。这一术语最早的意思是指哲学领域内对符号系统及信号系统所作的一般研究。在符号学
Scientific research on the nature of natural or man-made signal systems. The earliest meaning of the term refers to the general study of the symbolic and signaling systems in the field of philosophy. In semiology