id	keyword
american_scientific_journal-1821	system
american_scientific_journal-1821	time
american_scientific_journal-1821	state
american_scientific_journal-1821	space
american_scientific_journal-1821	structure
american_scientific_journal-1821	accident
american_scientific_journal-1821	phenomenon
american_scientific_journal-1821	response
american_scientific_journal-1821	function
american_scientific_journal-1821	incident