She cast around desperately for a safe topic of conversation.

她绞尽脑汁寻找稳妥的话题。

《牛津词典》

There was a time when talking about the weather was a safe topic of conversation.

曾几何时，天气是一个安全的谈论话题。

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Researchers from Warwick University, writing in the British Journal of Psychology, said that dogs gave people a safe topic of conversation with which to break the ice with a stranger.

BBC: Dogs help you make friends

It's probably safe to assume the topic of this mini-summit was how those states' delegates might be seated at the Democratic national convention and just whom they should represent.

NPR: Budget Vote Draws Presidential Hopefuls to Senate

Experts say hormonal contraceptives are relatively safe, but there is some mixed scientific research on the topic.

CNN: Gaps found in young people's sex knowledge