勤奋地

We should devote ourselves assiduously and faithfully to the duties of our profession.

我们应当勤奋地而且忠诚地献身于我们的职责。

He made a diligent attempt to learn Russian.

他勤奋地学习俄语。

His fidelity and industry brought him speedy promotion.

他的尽职及勤奋他很快地得到晋升。