久青草国产手机视频免费观看_毛片网站是多少_亚洲视频中文_一区二区高清在线

lactose

英 ['l?kt??z; -s] 美['l?ktos]
  • n. [有化] 乳糖

英英釋意


1. a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk;
"cow's milk contains about 4.7% lactose"