| 单词 | zone of optimal proportion | 
| 释义 | zone of optimal proportion [`zōn ǝv `äp·tǝ·mǝl prǝ`pȯr·shǝn]  IMMUNOLOGY One of three zones considered to appear when antigen and antibody are mixed; it is that zone in which there is no uncombined antigen or antibody. Also known as equivalence zone.  | 
	
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