about/around/some/or so/approximately/accurate/accuracy/exact
记忆：
1. about前缀ab-, 外；out, 外面；about prep. & adv. 在外面，周围，大约，关于When he walked about, he found there were about ten boys on the playground. 他在附近散步时发现操场上大约有十个男孩。
2. round [ raund ] adj. 圆的 prep. 围绕 There are some round vases round the teacher’s desk. 在讲桌周围有一些圆形花瓶。
3. around prep. & adv. 在周围，大约He came around five o’clock. 他在五点钟左右到的。
4. some adj. 一些，大约，某个Some boys said some man had just passed with some twenty little dogs. 一些男孩说有个男的带着大约二十条小狗刚刚过去。
5. or so, 或者如此， 大约（在数字之后）We have only five minutes or so left. 我们只剩下五分钟左右的时间了。
6. approximately ap-加强语气的前缀；pro-表示倾向；xim 音“些嘛”，一些嘛，不是准确的，ap-pro-xim-ate-ly adv.近似地, 大约 Some people, approximately ten, went to visit the old teacher ill in bed. 一些人，大约十个吧，去看望了卧病在床的老教师。
7. accurate Conforming exactly to fact; errorless a, 一；cur, cure, 治好，-ate为形容词后缀；ac-cur-ate，一点点错误都被治好了的， adj.正确的, 精确的 He has given us an accurate report. 他给了我们一份精确的报告。
8. accuracy n. 精确性, 正确度 I am sure of the accuracy of the report. 我相信报告是准确的。
9. exact Strictly and completely in accord with fact ex-act 前缀ex-表示“出来”，事实里面出来的， adj. 精确的, 准确的, 原样的 I need the exact number! 我需要准确的数字！
另类阅读：
Hearing “ There are about ten students round the table around 5 pm”, the teacher became impatient, “I need accuracy. Don’t tell me ‘some, approximately, or so, and so on’ again! Tell me the exact figure!”