extensive       
adjective uk/ɪkˈsten.sɪv/ us/ɪkˈsten.sɪv/
B2 广阔的,大面积的;覆盖范围广的
covering a large area; having a great range
  a school with extensive grounds 操场很大的学校 
 extensive repairs to the motorway 对高速公路的大规模维修 
 Her knowledge of music is extensive (= she knows a lot about music). 她的音乐知识非常广博。 
 The wedding received extensive coverage in the newspapers (= it was written about a lot). 报纸对这次婚礼进行了全面报道。 
 - More examples
 - The body was found after an extensive search by police with tracker dogs.
 - There is an extensive repertoire of music written for the flute.
 - Several of the crash victims had to have extensive plastic surgery.
 - Her knowledge of English grammar is very extensive.
 - The house needed extensive alterations when we moved in.