If you do not understand the meaning of some words you can have access to...

Dictionaries Online

• Online Visual dictionary:
  http://www.visuwords.com/


• Longman Dictionary of Contemporary English: http://www.ldoceonline.com/
  
• Oxford Advanced Learner's Dictionary online: http://www.oup.com/elt/catalogue/teachersites/oald7/lookup?cc=global


• Word reference http:// www.wordreference.com