Yes, they are online.

 

I like the freedictionary.com ( http://www.thefreedictionary.com/ )

and Webster (http://www.merriam-webster.com/dictionary).

I recently found Webster's advanced lerner's dictinary is very good as well.

It has a lot of example sentences:

http://www.learnersdictionary.com/

 

 

 

 

 

 

 

 

所有跟帖： 

• yup, co-like MW's learner's dictionary. -非文学青年- ♀ (0 bytes) () 09/05/2011 postreply 15:32:58

• learner dictionary on my toolbar now ~~ -jennea- ♀ (0 bytes) () 09/05/2011 postreply 18:18:19

• 谢谢教授！查英英字典从现在开始。Added to my favorites. -beautifulwind- ♀ (0 bytes) () 09/05/2011 postreply 22:10:11