cod-liver oil

基本解释

Fish processing factories: transfer of cod-liver oil, fish oil, dried fish floss and pomade;
魚類加工廠的魚肝油、魚油、魚松、魚渣的輸送；
www.chaolong.com.cn
But neither is whale tempting: chewing its skin is like gnawing a strip of leather soaked in cod-liver oil.
但是鯨魚也不吸引人，它的皮咀嚼起來就像浸泡在魚肝油裡的皮帶。
All these explanations are plausible, but I think there’s also something else responsible for our continuing to feed children this latter-day cod-liver oil.
這些解釋看起來都有道理，但是，我認爲還有某些其他原因，使我們不斷地喂給孩子這種“現代魚肝油”。
blog.sina.com.cn

Raw whale-meat bacon (a.k.a. blubber) was white, hard to swallow and tasted like pork fat injected with cod-liver oil.
FORBES: Magazine Article

Cod liver oil is a thick, yellow oil which is given as a medicine, especially to children, because it is full of vitamins A and D.