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。

youdao

The phrase 'to various future times, but not to all' suggested the image of bifurcating in time, not in space.

若干后世(并非所有后世)这句话向我揭示的形象是时间而非空间的分岔。

youdao

If only an image is used, the ToolItem needs to have a ToolTip (phrase or sentence of help information) that will be presented when the mouse is over the ToolItem to explain the function the image.

如果仅使用图片，那么ToolItem需要有一个ToolTip(帮助提供信息的短语或句子)，这样当鼠标停留在ToolItem上时，会显示ToolTip，解释图片的功能。

youdao

He adds to this image that is perfectly, sufficiently filled with grotesquery as it is -- he adds this next phrase: "and mad'st it pregnant."

他进一步描绘这幅景象，这是完全荒诞不经的了--下一句他写道：,“使它怀孕“

耶鲁公开课 - 弥尔顿课程节选

That's where I see a T-shirt, folded in a pile, with a brash, block-lettered phrase that is so mystifying and out-of-sync with the concerned image a nervous NFL is trying to present right now, that at first I double-take.

WSJ: At NFL Shop at Draft, a Rough Find