"The eyes light up and click. It happens -- 'I didn't know you had this.'" Jenny Johnson is the executive director of marketing for the Online Computer Library Center.

VOA: special.2011.07.11

So now, if I click the green flag, the program seems broken or--I don't know.

因此，如果你现在点击蓝色符号，程序可能会中断。

哈佛公开课 - 计算机科学课程节选