Author: dict.li   		Edition: 1   
		Update: 2008-08-01   
				Grade: 4	
	This dictionary is provided to you free-of-charge by a group of Chinese students at Germany. The goal of Dict.li is to make it possible to share your vocabulary knowledge with the world.
 
	
	
		Author: jukuu.com   		Edition: 2   
		Update: 2013-03-16   
				Grade: 
 
	Jukuu is a dedicated sentence search engine, which is speicially disigned to help Non-Enlgish users to write native English expressions by providing related bilingual sentences.
 
	
	
		Author: Princeton University   		Edition: 3.1   
		Update: 2011-08-08   
				Grade: 
 
	WordNet® is a large lexical database of English, developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations.