第二背鳍
/ˈsɜːtʃandɹˈɛskjuː antˈɛnəz/
n
English: second dorsal fin · 第二背鳍
释义：Swimming appendage formed of a membrane and rays located on the middle posterior dorsal portion of the body; it provides stability.
English: second dorsal fin · 第二背鳍