in a way that is very determined and thinks only about achieving a particular thing

The company has single-mindedly pursued its goal of creating a practical mechanical heart. 公司一心一意追求打造实用机械心脏的目标。

The country is fortunate to have a leader who is so single-mindedly focused on making things better for the people. 这个国家很幸运，有一位一心一意地致力于改善人民生活的领导人。