当你使用sprites制作悬停翻转效果时图片更替看起来间隔时间非常短。不同于翻转状态时加载文件，留下大量的空白直到该文件完全被加载。

When you use hover with sprites it makes for a seamless transition, unlike when you load the file on the hover state, which leaves a blank space until that file is loaded.

youdao

当你使用sprites制作悬停翻转效果时图片更替看起来间隔时间非常短。不同于翻转状态时加载文件，留下大量的空白直到该文件完全被加载。

When you use hover with sprites it makes for a seamless transition, unlike when you load the file on the hover state, which leaves a blank space until that file is loaded.

youdao