8A Unit 4英语笔记.docVIP

8A Unit 4 Numbers, Everyone’s language 1. at least 最少 at most 最多 2. in ancient times 在古代3. in many different ways用很多不同的方法 4. count [v.] 数 (counted, counted, counting) *countable [adj.] 可数的 uncountable [adj.] 不可数的 is a countable noun while water is an uncountable noun. *countless [adj.] 无数的 5. in tens 十进制 6. Greek(s) a./n. 希腊的，希腊人 Greece 希腊 Roman(s) a./n. 罗马的，罗马人 Rome 罗马 Egyptian(s) a./n. 埃及的，埃及人 Egypt 埃及 Indian(s) a./n. 印度的，印度人 India 印度 7. invent [v.] 发明 invention [n.] C 发明产物 U 发明 inventor [n.] 发明家 1) The invention of telephone made it easier for us to communicate. 2) Bell is inventor of telephones. 3) Printing was one of the greatest inventions in ancient China. 4) Who invented the light? Edison. 8. develop [v.] 发展，开发 (developed, developed, developing) China has developed a lot recently. *develop an idea He developed his business three years ago. China is still a developing country. （发展中的） America is already a developed country. （发达的） development [n.] U 发展 developer [n.] 开发者 9. calculating machines 计算器 calculating [.] 用于计算的 calculate 计算 calculation [n.] C 计算结果 U 计算 calculator 计算1) The teachers asked the students to calculate the width of the street. 2) Your calculation shows that the company didn’t make any profit. 3) Abacus was an ancient calculating tool. 4) We are not allowed to use calculators in a maths exam. 10. abacus [n.] 算盘 an abacus abacuses 11. accurate [adj.] 精准的 = correct accurately [adv.] *inaccurate [adj.] = incorrect 12. electronic [adj.] 电子的 *electron [n.] 电子 electric [adj.] 发电的，有电的，带电的 electrical [adj.] 与电有关的，电气的 electricity [n.] 电 *electrician 电工 1) We can buy all the electrical appliances at the supermarket. 2) Our life will be very inconvenient without electricity. 3) An electronic dictionary can help us look up the new words very fast. 4) How many electric kettles do you have? 5) My father is an electrical engineer. 6) The air-conditioner doesn’t work because of an electrical fault. We need an ele