To decide what the alternate text should be, think about what information the image conveys, and then describe this in a short phrase.
为了决定替代文本应该是什么，请考虑图像传达的是什么信息，然后用简短的短语描述。
You need to use alternate text for image submit buttons too.
您还需要将替代文本用于图像提交按钮。
There is one difference to note here: because an image button is a click-able form element, you should always provide alternate text for it.
这里有一个要注意的不同点：因为图像按钮是可单击的表单元素，所以您应该总是为它提供替代文本。
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