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词汇 pectoral fin
释义
pectoral fin
noun [ C ] biology specialized uk/ˈpek.tər.əl ˌfɪn/ us/ˈpek.tɔːr.əl ˌfɪn/
胸鳍(鱼身体前面两侧的鳍,用于控制和减速)
the fin on each side of a fish near the front of its body, used for controlling the direction the fish goes in and for slowing it down
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