视频对话：
Thirty minutes.
30分钟。
All right. We have to formulate a plan.
好的，我们得制定一个计划。
The White House War Room has an old Telex machine.
白宫战争小组有一个旧的电报机。
本期学习词汇：
formulate
vt.构想出，规划；确切地阐述；用公式表示
例句：
1. Little by little, he formulated his plan for escape.
他一点一点地设计构思出了逃跑的方案。
2. I was impressed by the way he could formulate his ideas.
他陈述观点的方式让我印象深刻。
3. We can then formulate the following rules.
我们可以作出下列规定。