电影里也有一些美国人，有那么一点对比作用。

It also contains some American, for a little contrast.

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这部剧也有一些美国人，有那么一点儿对比作用。

It also contains some American, for a little contrast.

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本文认为起对比作用的话题焦点应视作“对比话题”，起一般提示作用的话题可称作“一般（或自然）话题”，从而避免使话题与焦点在概念上产生混淆。

The author also gives his own views about so-called "topic-focus" or "minor topic", and suggests considering the "topic focus" as "contrast-topic" and the "topic-reminder" as "common topic" in or…

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the natural forces imaged in the ice storm.] Often you must have seen them Loaded with ice a sunny winter morning after a rain.

冰的自然作用作对比],下过一场冬雨，第二天，太阳出来,你准会看到白桦上结满了冰。

耶鲁公开课 - 现代诗歌课程节选