According to my personal experience I will choose a few important and necessary topics to discuss in the class.

根据我个人经验我将选取几个重要且必备的话题与大家讨论。

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It is organized in such a way, however, that excursions into special topics are not necessary for grasping the major principles of neural science.

不过某些课题对掌握神经学主要原理来说不是必须的。

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It will spend a brief amount of time discussing Rails in general, and Ruby syntax as necessary, but these topics are covered in much better detail elsewhere.

本文将花费少量的时间对Rails进行大致的介绍，如果有必要地话还将讨论一下Ruby语法，但是这些主题在其他地方有更详细的介绍。

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Our members are tutoring immigrant students and assisting them with their academics, serving as English as a Second Language instructors, connecting community members to services and resources in their local areas, conducting workshops on volunteer recruitment, health education amongst other necessary and important topics.

WHITEHOUSE: Connecting the Dots

They agreed to track their results and reconvene in three months to talk about lessons learned, morph and streamline their practices as necessary, develop a list of learning topics, and share their findings with leadership with the goal of transforming their entire culture.

FORBES: How to Eliminate Random Acts of Senseless Productivity