external gill [动] 外鳃
external gill cleft 外鳃裂
external crack gill 外鳃
The results demonstrated that the external morphological structure of gill rakes, the gill arches and the gill filaments showed the presence of various features such as annular ridge and short lines.
结果表明：鳃耙、鳃弓、鳃丝上皮细胞表面都有环形隆嵴、断续的短纹；
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