two-roll screen

Press these two keys to switch between documents on screen.

按这两个键就可以在屏幕上的文件之间进行切换。

You'll need to be able to project two images onto the screen as the new one fades in and the old image fades out.

你得能将两个图像投射到屏幕上，让新的渐渐淡入，旧的渐渐淡出。

Researchers flash two groups of different letters onto a computer screen.

研究者在计算机屏幕上显示出两组不同的字母。

On one part of the screen, a symbol would appear, and on the other side two symbols inside a circle were shown ．

在屏幕的一部分会出现一个符号,而另一部分则会显示圆内的两个符号。

If we set a good screen for him, or any of the guards, if they're going to put two guys on yao, there's no one to help, and he can attack the basket.

只要他们包夹姚明，必然漏出一大片空挡，如果给他做好掩护，或者给其他后卫做好掩护，没有人来协防，他就可以攻篮。