To improve one's professional skill has now become a common practice.

钻研业务已蔚然成风。

《新英汉大辞典》

To learn and master the customs and cultural background of English speaking countries is one of the most important ways to improve one's listening skill.

了解及掌握英国、美国风俗习惯及文化背景知识是提高英语听力技能的重要途径之一。

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