a shark's dorsal fin鲨鱼的背鳍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.There are usually no dorsal pores in the first few intersegmental grooves.身体前几个节间沟内经常无背孔....
The dorsal surface of its cuttlebone is yellowish and evenly convex.它的侧背面是微微的黄色,并且均匀的突起.dorsal muscles背肌Only the dorsal lip of the blastopore could induce altered development in the host.只有胚孔的背唇能够诱导宿主发育的改变.His dorsal fin...