1. be determined to do sth = make up ones’s mind to do sth
2. at the cost of He save the drowning boy at the cost of his own life.
3. a tough job 一项难做的工作 a tough problem 一项棘手的问题
4. make money earn money
5. experience n a terrible experience
v. Shanghai has experienced great changs in the past three years.
experienced adj He grew more experienced.
