流利说 Level 4 的 Great Discveries
The controlled use of fire allowed peoplecook food and survive in colder climates.
火的使用让人得以烹煮食物，并且在寒冷的气候下生存下来。
Fire provided light so that people could work and socialize for longer hours.
火为人提供光明，让人能够更长时间地工作和社交。
With the invention of agriculture, people could grow food and settle into conmunities.
农业的发明让人们可以种植粮食并且群居。
By growing food, people could spent less time hunting and more time for other things such as art.
种植了粮食，人们可以花更少的时间打猎，更多的时间在其他事情上，如艺术。
The demestication of animals allowed people to raising use of animals for food and work.
动物的繁衍使人得以饲养牲畜作为食物和工作。
By raising herds of animals such as sheep, people had a regular supply of meat and clothing.
通过饲养羊等牲畜，人有了固定的肉类和衣服供应。
The strength of animals such as horses and oxen was used for work and transportation.
牛马类动物力气大，可以用于工作和运输。
The development of tools and machines has result to more fishing manufactory and construction.
工具和机械的发展，促进了更多的渔业生产和建设。
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，就能用更少的人、更低的成本完成工作。
The development of science and 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方式。
With the understanding of electricity, telephones and radios allowed people to communicate in a long distance.
随着对电的理解，电话和收音机让人们能够远距离通信。
