As a soldier, he showed selfless devotion to duty.

作为战士，他表现出了对其天职的无私奉献。

《新英汉大辞典》

The teacher's selfless devotion to the cause of education is well known, and all her students respect and love her.

大家都知道那位老师对教育的无私奉献，所有学生都尊敬、爱戴她。

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Man selfless devotion; woman be selfless.

男人忘我地投入；女人投入得忘我。

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Heroic images of Hydro workers dangling from helicopters to restore broken cables suggested selfless devotion.

ECONOMIST: Canada: Hyper Hydro | The

She had most of the attributes of sainthood: a dauntingly selfless life, devotion to a higher cause, rude single-mindedness, a thick skin, and a capacity to wring the withers of the rich and powerful.

ECONOMIST: Mother Teresa