favourite          
 adjective [ before noun ] UK (US favorite) uk/ˈfeɪ.vər.ɪt/ us/ˈfeɪ.vər.ət/
A1 最喜欢的;特别喜爱的
best liked or most enjoyed
  "What's your favourite colour?" "Green." “你最喜欢甚么颜色?”“绿色。” 
 my favourite restaurant/book/song 我最喜欢的餐馆/书/歌曲 
 least favourite 最不喜欢的;特别不喜欢的
liked or enjoyed the least
  Cleaning the toilets is my least favourite job. 打扫厕所是我最不喜欢的工作。 
 - More examples
 - Swimming is my favourite form of exercise.
 - She imagined herself sitting in her favourite armchair back home.
 - 'Carmen' is my favourite opera.
 - She'd booked a table for four at their favourite restaurant.
 - My favourite subjects at school were history and geography.
 
favourite             
noun [ C ] UK (US favorite) uk/ˈfeɪ.vər.ɪt/ us/ˈfeɪ.vər.ət/
B1 最喜欢的东西;特别喜爱的东西
a thing that someone likes best or enjoys most
  How clever of you to buy chocolate chip cookies - they're my favourites. 你真聪明,买了带巧克力颗粒的饼干——这是我的最爱。 
  受宠的人;受偏爱的人
a person who is treated with special kindness by someone in authority
  the teacher's favourite 老师的宠儿 
 C2 最有希望获胜的人(或动物);比赛中最被看好的人(或动物)
the person or animal most people expect to win a race or competition
  Great Gold is the favourite in the 2.00 race at Epsom. 巨金被认为最有希望在埃普索姆赛马会中获得两英里赛的冠军。 
 [ + to infinitive ] Brazil are favourites to win this year's World Cup. 巴西队是今年世界杯赛的夺冠热门。 
 - More examples
 - It would be quite an upset if the favourite didn't win.
 - The film 'White Christmas' is a perennial favourite.
 - The odds-on favourite to win in the 3.30 race is Killjoy.
 - Manchester United and Arsenal were the pre-season favourites.
 - The band was belting out all the old favourites.