studious  
adjective uk/ˈstjuː.di.əs/ us/ˈstuː.di.əs/
  (LEARNING)      
  好学的;勤奋的,用功的
A studious person enjoys studying or spends a lot of time studying.
  She was a studious child, happiest when reading. 她是个好学的孩子,特别喜欢看书。 
   (CAREFUL)      
 [ before noun ]审慎的;刻意的,有意的;精心安排的 
very careful or paying attention to all the small details
  The report was obviously prepared with studious care and attention. 报告显然是经过精心准备的。