{ "items" : [
    { "id" : "http://dbpedia.org/resource/Stroke_(engine)"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Reciprocating motion, used in reciprocating engines and other mechanisms, is back-and-forth motion.  Each cycle of reciprocation consists of two opposite motions: there is a motion in one direction, and then a motion back in the opposite direction.  Each of these is called a stroke.  The term is also used to mean the length of the stroke."] } } }
