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Teacher:
Hi Chuck, today is your turn to make presentation. 
Chuck，今天该你做讲解了。
Chuck:
OK, let me just get the transparency and projectors ready.
好的，让我先把幻灯片和投影仪准备好。
Chuck:
Help, who can tell me how to make it showed in the screen?
谁帮我一下啊，怎么才能投影到屏幕上呢？
Leo:
Hi, buddy, just press the F2.
老兄，按F2。
Chuck:
How? May I just press the F and TWO at the same time?
怎么按？F和2同时按吗？
Leo:
Oh, god. Didn't you see the Key F2 on the top of the keyboard?
我的老天啊，你难道没看到键盘上方的F2键吗？