public function batchUpdate($presentationId, Google_Service_Slides_BatchUpdatePresentationRequest $postBody, $optParams = array())
  {
    $params = array('presentationId' => $presentationId, 'postBody' => $postBody);
    $params = array_merge($params, $optParams);
    return $this->call('batchUpdate', array($params), "Google_Service_Slides_BatchUpdatePresentationResponse");
  }