Topic 2 When was it invented? Section C New words servant 仆人，佣人仆人，佣人 for certain 确切，肯定确切，肯定 housework 家务劳动，家务活家务劳动，家务活 behave 行为，守规矩行为，守规矩 contribution 贡献，捐款，捐资贡献，捐款，捐资 make a contribution to 为为 作贡献作贡献 Teaching aims and demands 1. Learn some new words and expressions: servant, for certain, housework, make a contribution to No one knows for certain, but most people think that robots will be part of our lives. 2. Discuss the advantages and disadvantages of robots. Review Invention Inventor Year ca
