You were writing about the theme of night in the paintings of Vincent Van Gogh.

你写的是文森特·梵·高画中的夜晚主题。

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youdao

Its theme was "fire"; at night the sky over Xichang was as bright as that in the day with the light fire.

它的主题是“火”；在明亮的火光下，西昌夜晚的天空和白天一样明亮。

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The running theme of the night was the duality of games and the difficult balancing act Facebook is playing.

FORBES: Launching Platform-Wide Changes, Facebook Seeks to Up Its Social Game

The historic nature of Obama's candidacy, the first African-American to receive a major party's presidential nomination, was a theme of the night.

NPR: Obama Accepts Nomination With Sweeping Speech

In Bedford, Iowa, Lena Rinehart, 65, missed part of the debate because she fell asleep--"When I get in my recliner, it doesn't take too long"--but she woke up soon enough to hear Gore's main theme of the night.

CNN: latimes.com: In many voters' minds, debate fails in the drama department