湩
乳者，俗作奶，哺乳動物皆有之，蓋其所賴以飼子孫者也，乳皆出雌性，乳腺之精華也。人之初，幼弱不能化其所食，故以乳代之，作調代謝，護消化道之用，就人而言，需哺子近年，餘各有差，久之，人類乃牧牛、羊，取其奶充飲食之需，遂成大類，所用頗多。其中蛋白甚豐，頗益康健，今世人多好牛乳。復有酵發乳品，提煉精華而成食料者，奶酪、黃油、酸奶皆是。
常溫時，其酸鹼處六七之間，而性略酸。
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