sea slug
柯林斯词典
1. N any of various shell-less marine gastropod molluscs, esp those of the order Nudibranchia 任一一种裸鳃亚目动物→see nudibranch
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1. N any of various shell-less marine gastropod molluscs, esp those of the order Nudibranchia 任一一种裸鳃亚目动物→see nudibranch