单词：ahead_of_time 

副词

• 
  [1.r.ahead_of_time] (同义词:[early( adj. 早的, 早熟的, 及早的, 早先的, 早期的 adv. 早, 在初期 )]  [ahead_of_time(adv.提早 )]  [too_soon]  )
• 
  注释列句：before the usual time or the time expected; "she graduated early"; "the house was completed ahead of time"