Great Discoveries
The controlleduseof fireallowedpeople to cook food andsurvivein the colder climates.控制火的使用使人们能够烹饪食物并在寒冷的气候中生存。
Fire provided light so that people could work and socialize for longer hours.火提供了光，所以人们可以工作和社交更长时间。
With the invention of agriculture, people could grow food and settle into communities.随着农业的发明，人们可以种植食物并定居在社区。
By growing food, people could spend less time hunting, and more time for other things such as art.通过种植食物，人们可以花更少的时间打猎，更多的时间用于其他事情，如艺术。
The domestication of animals allowed people to raise and use animals for food and work.动物的驯化使人们能够饲养和使用动物作为食物和工作。
By raising herds of animals such as sheep, humans had a regular supply of meat and clothing.通过饲养羊群等动物，人类有了固定的肉类和衣物供应。
The strength of animals such as horses and oxen was used for work and transportation.马和牛等动物的力量被用来工作和运输。
The development of tools and machines has resulted in moreefficient manufacturing and construction.工具和机器的发展提高了生产和建设的效率。
With better tools and machines, work can be done with fewer people and at much lower costs.有了更好的工具和机器，可以用更少的人力和更低的成本完成工作。
The development of science engineering has improved many things, including communications.科学工程的发展改善了许多事情，包括通讯。
With an understanding of electricity, telephones and radios allow people to communicate over long distances.由于对电的了解，电话和收音机使人们能够远距离通信。
Science and engineeringhave changedthewaywe communicate witheachother.科学和工程改变了我们彼此交流的方式。
With the development of agriculture, people had more time for other activities.随着农业的发展，人们有更多的时间从事其他活动。
The use of machines has reduced the number of people needed to make things.机器的使用减少了制造东西所需的人数。
The ability toraiseherds of animalsgavehuman a regularsupplyof meat and clothing.人类有能力饲养成群的动物，因此有了固定的肉和衣服供应。
