移民故事一直是小说的流行主题。

Immigrant tales have always been popular themes in fiction.

《柯林斯英汉双解大词典》

在日本，手机拍摄的最流行主题之一就是食物。

In Japan, one of the most popular subjects for mobile snapshots is food.

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数学是程序员和分析人员的流行主题，从而导致了大量不同的工具可供选择。

Math is a popular topic with programmer and analyst types, leading to a huge diversity of tools to choose from.

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