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.

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。

youdao

Support tA Smooth Transition - do your best to complete all open assignments, have any remaining work well documented and organized in a file.

支持团队平稳的过渡——尽自己最大的能力完成所有已开启的任务，把余下工作保存并整理成档案。

youdao

Support a Smooth Transition - do your best to complete all open assignments, have any remaining work well documented and organized in a file.

支持团队平稳的过渡——尽自己最大的能力完成所有已开启的任务，把余下工作保存并整理成档案。

youdao