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重点讲解：
1. describe as 把…说成；把…称为；认为；
He described the meeting as marking a new stage in the peace process.
他称这次会议标志着和平进程进入了一个新阶段。
2. speed up 加快(…的)速度；
This system helps speed up access times.
这个系统有助于加快存取时间。
3. at the same time 同时；
We can't hold the two meetings at the same time; we must stagger them.
这两个会不能同时开，得错一下。
4. come up with 想出，提出(计划、想法等)；
30 years ago, scientists came up with the theory that protons and neutrons are composed of three smaller particles.
30年前，科学家们提出了质子和中子是由三种更小的粒子组成的理论。
