你一定看到过选择性使用颜色的例子：一个艺术家拍完了照片，将所有颜色去掉，只保留焦点位置的颜色。
Almost assuredly, you’ve seen the use of selective chromacity: an artist will take a photo and remove color from everything except the area of focus.
又一次的年轻艺术家成为美术馆的主角，成为社会关注的焦点。
Once again young artists become the leading roles and the focus of public concern in museum.
帖子发出后，立即被转发到国内其他多个论坛，卖红薯者的身份也成为网友热议的一个焦点——他是球迷还是行为艺术家？
The post was repasted in numerous BBSes and attention is drawn to the status of the seller---is he a football fan or a performance artist?
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