大学英语自学教程 上册 un16

[11:37.52]和给各个器官提供保护层，
[11:40.00]but only in small quantities.
[11:42.03]但需要量很少。
[11:44.05]Vitamins and minerals such as iron, calcium,
[11:46.87]维生素和矿物质，如铁、钙等，
[11:49.69]are another group of essential nutrients,
[11:51.92]是另一组基本养料，
[11:54.14]though the body does not need as great a quantity of these
[11:56.96]虽然人体对它们的需要不像对大量营养素
[11:59.78]as it does the macronutrients proteins, carbohydrates and fats.
[12:03.11]（蛋白质、碳水化合物和脂肪）的需要量那么大。
[12:06.44]There are two types of vitamins water-soluble vitamins and fatsoluble vitamins.
[12:10.37]有两种维生素：水溶性维生素和脂溶性维生素。
[12:14.30]Water-soluble vitamins like vitamin C and the B-group vitamins
[12:17.58]水溶性维生素，如维生素C和B类维生素
[12:20.86]do not stay in the body long
[12:22.78]在人体中停留的时间不长，
[12:24.70]and so foods containing these vitamins need to be taken rather often.
[12:27.64]所以需要经常吃含有这些维生素的食物。
[12:30.58]On the other hand,the fat-soluble vitamins
[12:33.36]另一方面，脂溶性维生素，
[12:36.14]vitamins A,D,E and K stay in the body for long periods of time
[12:40.76]如维生素A、D、E和K在人体中停留很长时间，
[12:45.39]and so there is no need to take foods containing them so often.
[12:48.61]所以没有必要那么经常吃含有这些维生素的食物。
[12:51.84]One way of getting enough nutrients while keeping one's weight down
[12:54.78]能够获得足够的营养但又能保持体重下降的一个办法是吃代用品，
[12:57.72]is to take substitutes for foods which contain too much fat.
[13:00.75]来代替含有过多脂肪的食物。
[13:03.78]For example, instead of regular milk, one can take skimmed milk,
[13:07.16]例如，可以喝脱脂奶而不喝普通奶，
[13:10.54]which contains as many proteins minerals as regular milk
[13:13.33]因为脱脂奶的蛋白质和矿物质与普通奶一样多，
[13:16.11]but has had the fat feinted,
[13:18.24]但其中的脂肪已经除掉了。
[13:20.37]In the same way,
[13:22.00]同样，
[13:23.63]vegetable oil can be used for cooking instead of animal oil.
[13:26.90]做菜时可以用植物油而不用动物油。