ScreenShade by EdTechTeam Chrome 插件, crx 扩展下载

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ScreenShade by EdTechTeamScreenShade by EdTechTeam lets you quickly and easily cover your screen, or a portion of it. You can use ScreenShade to hide the answers to questions, block out something you don't want an audience to see, or let students uncover if they know the answer. 

ScreenShade even has a built-in timer that you can set. When the timer is done, the shade disappears!

ScreenShade is proudly created by your friends at EdTechTeam, Inc.