Some negative people are triggered by certain topics.

有些消极的人一谈到某些话题就像被踩中要害一样。

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The textbooks also tend to distort the importance of certain topics.

这些教科书还具有错误解读某些主题的重要性的趋向。

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Lighten up: Certain topics, issues and events are serious but not everything is! Lighten up.

点睛：某些话题，观点和事情是很重要但却不是唯一。

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They focus more on who is influential and why on certain topics and trend this over time.

FORBES: The Democratization of Social Influence

But there are house rules against certain topics: politics, softball and chain saws.

FORBES: Finding Sanctuary on Nine-Eleven

The volume and velocity of conversation on certain topics can at the very least serve as a barometer of voter sentiment.

FORBES: Does Anyone Care About Voter Suppression?