Few topics interest so many different people in so many different ways as does the subject of food.几个主题的兴趣，因此在许多不同的人这么多不同的方式，一样的食物的主题。 Of course, people need to eat to stay alive, grow and develop, and maintain good health.当然，人们为了生存，成长和发展，并保持良好的健康需要吃。 This need presents ongoing challenges for humans: finding ways of growing crops and raising animals in the most efficient way in the conditions available, inventing methods for competing successfully against plant and animals that also...这需要为人类的持续的挑战：寻找种植，在现有的条件，在最有效的方式提高动物的方式，创造竞争对植物和动物，也成功的方法... Food is essential to human survival.食物是人类生存至关重要。 It provides the proteins, carbohydrates, fat, fiber, vitamins, and minerals needed to stay alive, grow, and stay healthy.它提供的蛋白质，碳水化合物，脂肪，纤维，维生素，矿物质，为了生存，成长，保持健康。 Food also serves other social and religious functions.食物也是其他社会和宗教功能。 Seder meals, birthday dinners, awards banquets, wake buffets, and other food-related functions bring people together for a host of cultural purposes.家宴餐，生日晚宴，颁奖宴会，唤醒自助餐，以及其他与食品相关的功能使人们团结在一起，为文化目的主机。 In some fundamental ways, the role of food in human society...在一些基本方式，在人类社会中的作用的食品... Questions about the value and safety of different categories of food are especially difficult to answer because people have been modifying foods almost since the dawn of civilization.有关的价值和不同类别的食品安全问题是特别难回答，因为人们已经修改的食物，几乎自从文明的曙光。 In fact, without certain types of food modification, the human species might never have survived on Earth.事实上，如果没有某些类型的食物修改，人类可能永远也不会在地球上生存。 By far the most common and oldest type of food modification used by humans is food preservation.迄今为止人类所使用的食品修改的最常见和最古老的类型是食品保鲜。 Imagine, for instance, a community...例如，试想，一个社区... 
