If you suspect that's happening, just ask: "Are we changing topics?"

如果你怀疑这件事是否发生时，只需问一问：“我们改变主题了吗？”

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When someone wants to hide something from you or lie to you, they'll try changing topics very frequently.

要是那人想掩盖什么的时候，就会频繁换话题。

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Sheldon: Excuse me. If we're changing topics, I believe I have first dibs with capybara, a rodent the size of a baby hippo.

谢尔顿：打断一下，如果我们要转换话题，我的话题应该有优先权，水豚，一种体型与河马宝宝相仿的啮齿类动物。

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Their research and design is on game-changing topics from how people in sub-Saharan Africa and India use computers and cell phones, to the use of Twitter and social media during crisis, to how digital gaming contributes to business relationships in China, to how American families control internet use at home.

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Since he stepped down as governor of Massachusetts, other Republican candidates have accused Romney of changing his opinion on topics such as gun control, abortion and gay marriage.

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You can customize how it picks content, according to Michael Muller one of the researchers behind the Social Lens project, by changing the initial seed topics, or by selecting an emphasis on people or content items.

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