有效的简历是不是该包括所有的经验

An resume should include only the last ten years of experience.

Content of your resume should be selected strategically to support your focus and value proposition. While it is true that readers of your resume will be most interested in your most recent experience, there is often value in including experience further back in your history. Perhaps your early career includes work for well-known, prestigious companies. Perhaps you want to document the full scope of your cross-industry experience, much of which occurred in your early career. Perhaps you believe some valuable networking opportunities may come out of your experience 15 or 20 years ago. Or perhaps your most impressive accomplishments were in a position you held 12 years ago. In any case, it will be apparent to the reader that your executive career did not suddenly materialize ten years ago so there is little harm and many benefits to summarizing this early experience. Of course, this does not mean that you must give equal page weight to your early career. If you feel early dates will be used to screen you out, subtly leave them out of your early career summary. If some early career positions have more strategic relevance than others, give them more emphasis in your summary. Think carefully about the content of your resume. If there is solid reasoning behind your desire to present early experience, than do so.

中文参考：

简历应该只包括最近10年的经验。

简历的内容应该有选择的提供来支持你简历中的重点内容。虽然简历阅读者是对你最近的一份工作最感兴趣，但是同样也对更早的一些工作经历感兴趣。或许你更早的一些的工作是在比较有名气的公司里。或许能够更加完善你的工作经验。或许你印象最深刻的成就确实是在12年前的工作中得到的…虽然对阅读者而言，你十年前的工作经验很难物化地去理解，但是，描述这早期的工作经历并无大碍却说不定会有很多好处。当然，这并不是说非得要花纸张去说明过去的经验，而应该视情况而定。如果早期的工作经验并无特色，完全可以省去。如果恰恰相反，早期的工作比其他的更重要，那就要着重描述一下了。一定要花费心思好好想想简历的内容，如果描述早期的工作经验确实很有必要，那就写吧。