时尚杂志上缺乏黑人面孔去年再次成为一个热门讨论话题。自1970年代以来，这方面有了哪些变化？

The lack of black faces in fashion magazines was, again, a major subject of debate last year. What has changed since the 1970s?

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在公交车上给老人让座已经成为讨论的热门话题。

Offering one's seat to elderly people on buses has become a hot topic of discussion.

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近来，盗版成为人们讨论的热门话题。

Recently, piracy has become a hot topic under discussion.

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