Or at least pectoral fin. But tetrapods, which evolved from fish, did.
但是从鱼类进化来的四足动物却有这种结构。
Pectoral Pertaining to the breast. Also, referring to one pectoral fin.
胸的属于胸部的。同时，指的是一个胸鳍。
The first pectoral fin ray of the male is somewhat thicker than that of female.
第一胸鳍曙光男是有点粗多于女生。
At the moment, the male will keep the jitter, and frequent rowing pectoral fin.
此刻, 雄鱼将会不停的抖动, 并频繁的划动胸鳍。
Disk length The length from the snout tip to the posteriormost margin of the pectoral fin in Rajiformes.
体盘长度鳐型目从吻部顶端到胸鳍最后面边缘的长度。
separating An elasmobranch reproductive behavior wherein the male releases the pectoral fin of the female, setting her free.
行为, 为雄鱼放松雌鱼的胸鳍, 并放它自由。
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