There is very important difference between Japanese and English. To put it simply, in Japanese, you can cut out a lot more words from your sentence when you speak casually. This is called "ellipsis". English is not as flexible as Japanese when it comes to cutting out words from your sentence. This difference is often the cause of many mistakes that Japanese speakers make when they speak English.
Milt is the seminal fluid of fish, mollusks, and certain other water-dwelling animals which reproduce by spraying this fluid, which contains the sperm, onto roe. It can also refer to the sperm sacs or testes that contain the semen. Wikipedia
スケトウダラとマダラの精巣は なぜ「タチ」と呼ぶのか
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