重点讲解：
1. go on 继续说下去；
例句：Meer cleared his throat several times before he went on.
梅尔清了几次嗓子，又接着往下说。
2. first of all 首先；第一；
例句：First of all ,let us see how much it will cost.
首先，让我们看看它要花多少钱。
3. crank up 开大，调高；
例句：The manger wants us to crank up the production line.
管理人员希望我们提高生产线的作业速度。
4. throw up 呕吐；呕出；
例句：She said she had thrown up after reading reports of the trial.
她说，她看完审判报告后都吐了。
