early 15c., from Old French dorsal (14c.) or directly from Medieval Latin dorsalis, corresponding to Latin dorsualis "of the back," from dorsum "back," which is of uncertain origin.
实用例句
1. a shark's dorsal fin
鲨鱼的背鳍
来自《权威词典》
2. 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.
来自英汉文学 - 老人与海
3. 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.
来自辞典例句
4. The heart is dorsal and is provided with paired ostia.
心脏位于背方,有一对心门.
来自辞典例句
5. Only the dorsal lip of the blastopore could induce altered development in the host.