Those, in turn, can be implemented using Universal resource Locator (URL) or Portable Document Format (PDF) technologies that are too reusable resources of the ec, just at a finer level of detail.
反过来，这些可以通过使用统一资源定位器(Universal Resource Locator, URL)或者可移植文件格式(Portable Document Format, PDF)技术来进行实施，这些技术是更深层次上ec的可再用资源。