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。

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

youdao

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。

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

youdao