stamina
/ˈstæmɪnə; `stæmənə/ n[U]
ability to endure much physical or mental strain; long-lasting energy and resilience; staying-power 精力; 耐力; 韧劲
Marathon runners need plenty of stamina. 参加马拉松长跑要有耐力.
He doesn't have the stamina to be a teacher. 他没有当教师的精力.