万万没想到：原来红薯这么有营养！
英语课
Here are some facts about sweet potatoes you probably don't know:
这里有一些关于红薯你可能还不知道的事实：
Sweet Potatoes Originated in the Americas
红薯起源于美洲
They're in the family of plants that includes morning glories and are in a different family than yams. Yams are from Africa and are more closely related to lilies.
红薯和牵牛花是同一科的植物，但和山药不属于同一科。山药源于非洲，和百合花关系更近。
A 5000 Year-Old Food
红薯有5000年的历史
When Christopher Columbus arrived in the Americas in the 15th century, sweet potatoes were already a staple 1 crop. He took some with him back to Spain and by the 16th century, gardens all over Europe were growing them.
15世纪哥伦布到达美洲，那时红薯已是当地的主要作物了。他带了一些回西班牙，到了16世纪整个欧洲的花园都种植红薯。
A Rich Source of Beta-Carotene
红薯富含β-胡萝卜素
This powerful antioxidant gives the tuber its yellow, gold, or orange (and sometimes even purple) coloring and coverts 2 to vitamin A in your dog's body. It's thought to reduce the risk of certain types of cancer and provide protection against heart disease.
强大的抗氧化剂使得这种块茎呈黄色、金色、或橙色(有时甚至呈紫色)，并在你的体内转化成维生素A。有降低患某些癌症风险的功效，并预防心脏病。
A Good Source of Minerals
富含矿物质
Sweet potatoes are a good source of potassium, manganese, and magnesium 3. They also contain calcium 4, iron, and zinc 5 but are low in sodium 6.
红薯富含钾、锰、镁，同时也含有钙、铁、锌，但钠含量比较低。
High in Fiber 7, Low in Fat
高纤维、低脂肪
Sweet potatoes are high in dietary fiber which is great for digestive health. Plus, they contain very little fat.
红薯富含膳食纤维，对消化大有健康益处。另外，红薯含的脂肪很少。
A Healthy Alternative
健康的选择
White potatoes may be cheaper than sweet potatoes but sweet potatoes have more nutritional 8 value. Plus, white potatoes have more carbohydrates 9 which can lead to obesity 10 and blood sugar problems.
土豆比红薯便宜，但红薯的营养价值更高。另外，土豆含的碳水化合物偏多会导致肥胖和血糖问题。
n.主要产物，常用品，主要要素，原料，订书钉，钩环；adj.主要的，重要的；vt.分类
- Tea is the staple crop here.本地产品以茶叶为大宗。
- Potatoes are the staple of their diet.土豆是他们的主要食品。
n.隐蔽的，不公开的，秘密的( covert的名词复数 )；复羽
- But personage inside story thinks, this coverts namely actually leave one's post. 但有知情人士认为，这实际上就是变相离职。 来自互联网
n.镁
- Magnesium is the nutrient element in plant growth.镁是植物生长的营养要素。
- The water contains high amounts of magnesium.这水含有大量的镁。
n.钙(化学符号Ca)
- We need calcium to make bones.我们需要钙来壮骨。
- Calcium is found most abundantly in milk.奶含钙最丰富。
n.锌；vt.在...上镀锌
- Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。
- Zinc is used to protect other metals from corrosion.锌被用来保护其他金属不受腐蚀。
n.（化）钠
- Out over the town the sodium lights were lit.在外面，全城的钠光灯都亮了。
- Common salt is a compound of sodium and chlorine.食盐是钠和氯的复合物。
n.纤维，纤维质
- The basic structural unit of yarn is the fiber.纤维是纱的基本结构单元。
- The material must be free of fiber clumps.这种材料必须无纤维块。
adj.营养的，滋养的
- A diet lacking in nutritional value will not keep a person healthy.缺乏营养价值的饮食不能维持人的健康。
- The labels on food products give a lot of information about their nutritional content.食品上的标签提供很多关于营养成分的信息。
n.碳水化合物，糖类( carbohydrate的名词复数 )；淀粉质或糖类食物
- The plant uses the carbohydrates to make cellulose. 植物用碳水化合物制造纤维素。 来自《简明英汉词典》
- All carbohydrates originate from plants. 所有的碳水化合物均来自植物。 来自辞典例句
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红薯