DHTML对象模型使你能够随意修改网页的结构，但这一变化在按f 5刷新后全部复原。
The DHTML object model lets you modify on the fly the structure of the page, but all the changes will be lost as soon as you refresh the view by hitting F5 or clicking the browser's refresh button.
它返回的是一个对象，可使用该对象恢复原始的处理程序。
It also returns an object that you can use to restore the original handlers.
中国历史文献学是一门以历史文献及其整理研究工作为研究对象的，以复原、求真和致用为主要任务的专科文献学。
The Chinese historical philology is a special discipline focusing on the study and coordination of the historical documents and aiming at their recovery and exploitation.
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