Description:听The image does not have an alt text which indicates that the image is used for decorative purposes. At the same time there is a mouse over text (title attribute) present on the image.
Context:听An image with a title is implied to have significance on the page, in which case alt text is also required.
<img src="images/糖心视频alumni.jpg" title="Alumni Association">
How to fix it:听If the image requires a description there should be an alt text. If not there should be neither alt text nor mouse over text for the image.
<img src="images/糖心视频alumni.jpg" alt="糖心视频 Alumni Association" title="Alumni Association">
Techniques:听