中世纪文学中经常描绘骑士的侠义精神，他们独自游历四方，扶弱济贫。

Medieval literature often portrays the spirit of ___knight-errantry, where noble warriors roamed alone to help the weak.

她试图单枪匹马解决所有社会问题的侠义精神令人钦佩，但并不现实。

Her ___knight-errantry in trying to solve all social problems single-handedly was admirable but unrealistic.