degrade gracefully

基本解释

HTML 5 was explicitly designed to degrade gracefully in browsers that don't support it.
HTML 5 的設計原則就是在不支持它的瀏覽器中能夠平穩地退化。
Most of the time, you want to degrade gracefully or return a polite message to the user.
大多數情況下，您要柔和或有禮貌的消息返廻給用戶。
If this is done well, earlier versions of applications can even degrade relatively gracefully when they read newer saved documents -- usually by just ignoring unfamiliar tags and attributes.
如果做得好，應用程序的早期版本在讀取較新的保存文档時甚至可以相對溫婉地降級使用——通常衹需要忽略不能識別的標簽和屬性。