Paying kids for housework is one of the most popular topics, especially at a time when everyone is more careful about money.

为孩子做家务付钱是最流行的话题之一，尤其是在这个大家都对钱都更谨慎的时代。

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Health his one of the most popular topics in our life.

健康是我们生活当中最常见的话题之一。

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This is one of the most popular topics discussed in the environment studies.

这是环境研究领域一个广泛研究的主题。

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This week, railway reform is one of the most popular topics on weibo, with over 10 million discussion threads.

BBC: Demise of China's unloved railways ministry

Because people expect the most popular topics become Twitter Trends, the company comes off looking like the bad guy here.

FORBES: Prompted By WikiLeaks Queries, Twitter Finally Explains Trends Algorithm

The perception of Twitter Trends, however, has been that the most popular topics are the ones that make it to the top.

FORBES: Prompted By WikiLeaks Queries, Twitter Finally Explains Trends Algorithm