重点讲解：
1. set out to do sth. 开始；着手；
He has achieved what he set out to do three years ago.
他已经实现了他3年前的奋斗目标QI^9pmd0&c~rv,D=oo。
2. be exposed to do sth. 使暴露于（险境）；使遭受（危险或不快）；
This part of the west coast of Scotland is very exposed to Atlantic winds.
苏格兰西海岸的这一段完全暴露在大西洋海风前k^G|+_Y-!ejI^@t。
3. care about 关心；在乎；在意；
They were tuned in to their own needs and didn't care about the feelings of other people.
他们只顾自己的需求，不在乎别人的感受8P7gCi;%O|nKkL5EwLBq。
4. react to （作出）反应；回应；
Someone allergic to milk is likely to react to cheese.
对牛奶过敏的人可能对奶酪也有不良反应fkkuD#fmc0u@fKl。