substantial  
adjective uk/səbˈstæn.ʃəl/ us/səbˈstæn.ʃəl/
  (LARGE)      
 B2 大的;可观的;价值巨大的;重大的
large in size, value, or importance
  The findings show a substantial difference between the opinions of men and women. 这些发现表明男性和女性之间存在着重大的意见分歧。 
 She inherited a substantial fortune from her grandmother. 她从祖母那里继承了一笔数目可观的遗产。 
 The first draft of his novel needed a substantial amount of rewriting. 他小说的初稿有很多地方需要重写。 
 - More examples
 - a substantial chunk of our profits
 - The police have been ordered to pay substantial damages to the families of the two dead boys.
 - The Green Party have called for a substantial reduction in the emission of greenhouse gases by the UK.
 - All the evidence points to a substantial rise in traffic over the next few years.
 - There will be substantial job losses if the factory closes down.
 
  (GENERAL)      
 [ before noun ] formal基本上的;大体上的 
relating to the main or most important things being considered
  The committee was in substantial agreement (= agreed about most of the things discussed). 委员会基本上达成了一致意见。