重点讲解：
1. ahead of 提前；
Thanks to your help, we accomplished the task ahead of schedule.
亏得你们帮忙，我们才提前完成了任务。
2. attribute to 把…归因于；把…归咎；
They attributed the success of their invention to Engineer Huang.
他们把发明的成功归于黄工程师。
3. in advance 提前；事先；
Everything has been fixed in advance.
一切都是事先确定好了的。
4. put into operation （使）施行；（使）实行；（使）生效；
In order to be put into operation, a large number of parts had to be replaced.
必须大量更换零部件，才能投入运转。