laboriously       
adverb uk/ləˈbɔː.ri.əs.li/ us/ləˈbɔːr.i.əs.li/
 耗时费力地;艰巨地,艰难地
in a way that needs a lot of time and effort
  He wrote out the list laboriously by hand. 他费力地用手写出了这张清单。 
 This is a highly detailed, laboriously researched study. 这是一项非常详细、悉心做出的研究。 
 See: laborious
 - More examples
 - The wildflowers are laboriously hand pressed to make perfumes.
 - The animals were slowly, laboriously moving around their enclosure.
 - He obtained a dictionary and laboriously set about reading it.