mettlesome

这位年轻的运动员在比赛中表现出了十足的斗志与活力。

The young athlete showed a ___mettlesome spirit throughout the competition.

尽管在资源上远远落后，这位充满斗志的年轻律师仍拒绝向财力雄厚的公司低头。

The ___mettlesome young lawyer refused to back down from the well-funded corporation despite being outmatched in resources.

她对那些不公批评充满勇气的回应，让所有以为她会保持沉默的人都感到惊讶。

Her ___mettlesome response to the unfair criticism surprised everyone who had expected her to stay silent.