Writing about a topic helps you integrate new knowledge with what you already know.

围绕某一题目写作有助于你将新知识和已有知识结合起来。

《柯林斯英汉双解大词典》

Occupational jargon requires deep knowledge of a particular topic.

职业行话需要有关特定主题的深入知识。

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They are always searching for much information on a topic they're interested in and looking for new experience or opportunities to improve their knowledge or skills.

他们总是在寻找关于他们感兴趣的话题的信息，寻找新的经验或机会来提高他们的知识或技能。

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David, like all our full-time editors and reporters as well as our contributors, is building his own brand and community around his topic-specific knowledge.

FORBES: Turning Forbes magazine content into Web content -- and vice versa

They understand and like the concept of crowdfunding. 67.75% feel their specific knowledge of crowdfunding as a topic is high, ranking their understanding at a level of 8-10.

FORBES: Earlier this year I wrote in Harvard Business Review