Unit 5 The power of nature
I. Phrases
1. a volcano erupting 一次火山爆发
2. an active / a live volcano 活火山
3. compare…with / to… 把……和……进行比较
compare…to… 把……比作……
4. imagine doing sth. 设想做某事
5. take risks / a risk 冒险
at risk 处于危险之中
at the risk of doing sth.…冒……危险
risk doing sth.冒险做某事
6. meet with sb. 碰到、遇到某人
