| 单词 | metallic circuit | 
| 释义 | > as lemmasmetallic circuit   metallic circuit  n. Telegraphy a telegraphic circuit in which the return path of the current is through a metal conductor (e.g. a wire) rather than through the earth; (also) the wire completing such a circuit. ΚΠ 1854    W. F. Cooke Electr. Telegr. 25  				If, from the copper at one end, a piece of wire, or metallic circuit is carried..round to the zinc..a current of electricity immediately passes through the wire. 1892    Montreal Weekly Gaz. 21 July 8/7  				The Public may now obtain telephonic communication over its long distance metallic circuit lines. 1994    Jrnl. Polit. Econ. 102 107  				The technology of long-distance transmission required the installation of higher-quality and more costly equipment, for example, two-wire metallic circuits. < as lemmas  | 
	
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