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www.dictionarytoday.com and www.103.net allows users to utilize keyword searches for dictionary definitions, thesaurus options and other resources in Chinese and English. The resource accesses content from more than a dozen electronic reference titles, including: The American Heritage Dictionary of the English Language; The American Heritage Dictionary of Idioms; The American Heritage Science Dictionary; The American Heritage Stedman's Medical Dictionary; The New Dictionary of Cultural Literacy; and Roget's II: The New Thesaurus. Provided by China Directory Publishing (CDP) and the Houghton Mifflin Company.

http://www.loc.gov/rr/ElectronicResources/full_description.php?MainID=1554
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Some of the sentences on that site look a little strange, Anon. They're not always idiomatic.

MrP
Comments  
Hi everyone!!

Check out this Dutch site!!! It's got some great tips for learners of the English language!!

herfstonline.comp.nl
 MrPedantic's reply was promoted to an answer.