Transclude Token is a Drupal module that defines a token that can be used to transclude external content into a node. This can be very handy for when you want to reuse language from an outside source (or even an internal one) without having to copy and paste, which can be a pain if the outside source changes. transclude allows you to reference an @id tag in an external web page and load it dynamically, so that when the outside source changes, the reference in your page changes too.
You can transclude content into a Drupal node by using the transclude token, [transclude:'https://url.to/transclude#anchor'] (be sure to quote the URL). Drupal will recognize this token, load the specified page, extract the section with the specified anchor, and output it into the node wrapped in a <blockquote class="transclude"> tag.
Please note that in order for tokens to be recognized and expanded within nodes, the token_filter module must be enabled along with token replacement in any text format that it may be used with. See http://www.ryanwright.me/cookbook/drupal7/contrib-modules/token-filter for more information on how to configure token replacement in nodes.
If you are in control of the external content to be transcluded, the easiest way to make it transclusion-friendly is to wrap the content you want to transclude in a <div id="name"> tag. The transclusion token will then grab all of the content inside that <div>. Note that the transcluded content does not have to be inside any particular element, but <div> and <span> are the most semantically valid choices.