His dorsal fin was down and his huge pectorals were spread wide.

它的脊鳍朝下耷拉着，巨大的胸鳍大张着。

“Pectorals are the motor for 80 percent of flight,” said Dr. Tobalske, which explains why they are the largest part of the anatomy.

“胸肌担负了飞行中80%的动力来源，”托巴尔斯克博士说，这也解释了为什么在鸟类解剖形态中，胸肌所占的比重最大。