重点讲解：
1. due to 由于；因为；
The train had stopped due to a mechanical problem.
火车因为机械故障停了下来=2|pYV7~J~UIw-u;(JKS。
2. go up （价格、数量或水平）上涨，上升；
If costs go up, there will be a pro rata increase in prices.
如果成本增加，价格就会相应上涨%8(_x8RiYRe。
3. on average 平均起来；按平均值；
400 people a year die of this disease on average.
平均每年有400人死于这种疾病ODEpKl(q|xW]!UZqlx。
4. for sure 无疑；肯定；
One thing is for sure ─ it's not going to be easy.
有一点可以肯定——事情不会很容易6Er;]yPadno_]!x。