operculum
柯林斯词典
1. N the hard bony flap covering the gill slits in fishes 鰓蓋
2. N the bony plate in certain gastropods covering the opening of the shell when the body is withdrawn 蘚蓋
返回 operculum
1. N the hard bony flap covering the gill slits in fishes 鰓蓋
2. N the bony plate in certain gastropods covering the opening of the shell when the body is withdrawn 蘚蓋