as·sid·u·ous·ly
adverb/əˈsɪdʒuəsli/
/əˈsɪdʒuəsli/
(formal)- in a way that involves working very hard and taking great care
刻苦：以一种非常努力地工作和谨慎的方式 - He worked assiduously to earn the money for his son’s education.
他勤奋工作，挣钱供儿子读书。
- He worked assiduously to earn the money for his son’s education.