单词：laboring 

形容词

• 
  [1.a.laboring] (同义词:[drudging]  [laboring( n. 劳动, 操劳 )]  [labouring( n. 劳动, 操劳 )]  [toiling]  )
• 
  注释列句：doing arduous or unpleasant work; "drudging peasants"; "the bent backs of laboring slaves picking cotton"; "toiling coal miners in the black deeps"
• 近义词 -> [busy( adj. 忙碌的, 热闹的, 临时占用的 )]