Unit 1
1. make a survey of sth 调查/纵观某事
2. add sth “增加，补充说道”
add sth to sth把..和..相加
add to = increase增加
add up/together 合计，加起来
add up to 总计达
3. point out 指出 point at/ to指向
4. be upset不安; 难过
5. ignore something不理睬，忽视
6. have got to (had got to ) 必须，不得不
7. be concerned about 为…担心
