To be willing but unable to do something; one's strength does not match one's desire.
虽然他很想参加这次长跑比赛，但因旧伤复发，只能遗憾地感叹自己力不从愿。
Although he really wanted to participate in this long-distance running race, due to the recurrence of an old injury, he could only regretfully sigh that he was willing but unable.
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