per·ti·nac·i·ty
noun/ˌpɜːtɪˈnæsəti/
/ˌpɜːrtnˈæsəti/
[uncountable] (formal)- the quality of being determined to achieve a particular aim despite difficulties or opposition
坚定不移的；坚决的；义无反顾的 - With his usual pertinacity, he pursued this new line of enquiry.
他以一贯的执着追求了这一新的探究方向。
- With his usual pertinacity, he pursued this new line of enquiry.