YOU SAID:
This milk is goat milk
INTO JAPANESE
このミルクはヤギのミルク
BACK INTO ENGLISH
Goat's milk is milk
INTO JAPANESE
ヤギのミルクは牛乳
BACK INTO ENGLISH
Goat's milk is milk.
INTO JAPANESE
ヤギのミルクは牛乳です。
BACK INTO ENGLISH
Goat's milk is milk.
That didn't even make that much sense in English.