| 单词 | plain muscle | 
| 释义 | > as lemmasplain muscle   plain muscle  n. smooth muscle (see smooth adj. 1b(a)). ΚΠ 1895    New Sydenham Soc. Lexicon  				Plain muscles, unstriated muscles, as opposed to striated muscles. 1940    G. S. Carter Gen. Zool. Invertebr. xviii. 366  				Both striped and plain muscle may remain for long periods in a state of partial contraction. This is called tonic contraction and the extent to which the muscle is contracted during such a contraction is called the tone of the muscle. 1981    Philos. Trans. 		(Royal Soc.)	 B. 294 492  				Two bands of cilia are present, as too is a sphincter of plain muscle. < as lemmas  | 
	
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