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We sat and watched the sun setting.

我们坐着看太阳渐渐落下去。

《牛津词典》

In the background we can see the sun setting.

在背景中我们可以看到太阳正在落山。

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The water gently laps beneath the deck of our villa, as we admire the sun setting over the Straits of Malacca.

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