整数的单位有:hundred，thousand，ten thousand，one hundred thousand，million，ten million，a hundred million ，billion ，hundred thousand million billion等。
英语国家的数字采用三位一隔，英语中没有“万”“亿”，只有“千”（thousand）、“百万”（million）、“十亿”（billion）、“万亿”（trillion），为了国际通用，我们也采用这种分割方式。当然也有一些转换公式可以帮助我们更快地读出这些数字？
许多人在遇到数字时，总得转一下思维，但就是转不过来，导致错误频出。那么，这个“万”字有没有可能像“好久不见”变成 long time no see，“好好学习天天向上”变成 good good study day day up 一样进入英语，使数字表达变得对中国人友好呢?
在日常生活和工作中，“费用”无处不在，从购物的小额支付到企业的大额开支，它都扮演着不可或缺的角色。然而，英语中对于“费用”的表述远不止“expense”一个词，掌握这些词汇不仅能提升你的英语表达能力，还能让你在跨文化交流中更加游刃有余。
重难点词汇:defensive adj 存有戒心的，防御的coworker n 同事 occasionally adv 偶尔，有时 practice v 实行，奉行 n惯常做法holistic adj功能整体性的graduate n毕业生conventional adj 传统的alternative adj 可替代的 relief n减轻，缓解 疾病ease v减轻suffering n 疼痛 approach n 方法 indication n 迹象 membership n 会员数advocate v 提倡complexity n复杂性effectiveness n有效性emphasize v 强调。
0 zero 1 one 2 two 3 three 4 four。表示价格划算:a good buy， a better buy， an excellent price， a good price/ bargain.
- 英文:Dinosaurs lived on Earth more than 60 million years before human beings. They lived in every corner of the Earth. Some dinosaurs were as small as chickens. Others were as big as ten elephants. Some could even fly. Many dinosaurs ate plants. But there were also some dinosaurs that liked to eat meat. Dinosaurs lived on Earth for more than 150 million years. Later， suddenly， they all became extinct. No one knows why. But we can learn about them through dinosaur fossils.
