当鼠标点下时，除了检查真假还能检测什么？哈佛公开课中出现no answer的视频截图 …

What else can you detect as a yes or no answer is the mouse down?

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如果你想要修改日期或者时间，用鼠标点选使要修改的部分高亮显示，然后实用键盘的“上”“下”键来增加或减小数值。

To change any "component" of the date or time, click on it with the mouse to highlight it, then use the up and down arrow keys on the keyboard to increase or decrease the value.

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What else can you detect as a yes or no answer is the mouse down?

当鼠标点下时，除了检查真假还能检测什么？

哈佛公开课 - 计算机科学课程节选