其基本思想是让用户感觉不必等待页面更新。
The idea is to make users feel as though they never have to wait for a page to update.
这种情况通常很慢，页面更新往往需要用户等待很长时间。
This is often so slow that the user has to wait a significant amount for time for the page to update.
Ajax允许浏览器在页面更新的间隔同服务器进行交流。
Ajax lets the browser communicate with the server between page updates.
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