When you click the rectangle, it fades out, and moving the mouse over the circle causes its color to change.

单击矩形时，它会淡出，在圆形上面移动鼠标时，它的颜色会改变。

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When clicked, the rectangle changes its color by calling the same script as the circle did.

单击时，这个矩形会与前面的圆形一样调用同一个脚本改变其颜色。

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The color wheel or color circle is the basic tool for combining colors.

色轮，又称色圈是组合颜色最基本的工具。

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Unlike Facebook, there's a feature called the Giving Circle, a multi-colored wheel where each color represents a charity category, such as disabilities, environment, and human rights.

CNN: Social networking adds new friend: Philanthropy