In the 20th century, the first four notes were used by other musicians to make different types of music like hiphop and rock and roll.

在20世纪，其他音乐家会使用前四个音符创作不同类型的音乐，如说唱乐和摇滚乐。

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In the 20th century, airplanes replaced trains for long distance travel.

在20世纪，飞机代替了火车进行长途旅行。

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In the 20th century the main threat to international security was superpower conflict; today it is failing states.

20世纪，国际安全的主要威胁是超级大国之间的冲突，而如今的主要威胁是国家的衰落。

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Early in the 20th century, a writer prepared a collection of Paul Bunyan stories.

VOA: special.2009.01.24

And we can argue about whether or not that's work, but that has been the intention certainly in the 20th century and now 21st.

我们可以对这种现象有所争论，但这个观点,肯定是20世纪和现在21世纪的焦点。

普林斯顿公开课 - 人性课程节选

Because Albert Einstein, who I had on my wall,as a undergrad he meant so much to me, not only we both play the violin, the most brilliant mind and intelligence in the 20th century.

我还是大学生的时候，我家墙上有一副爱因斯坦的画像,他对于我来说非常重要，不仅因为我们都拉小提琴，20世纪最聪明最有智慧的人。

普林斯顿公开课 - 人性课程节选

After all, partitions in music only started in the 20th century Chopin was a pop musician.

WSJ: Jean-Yves Thibaudet | A Classicist in the Modern Age | Cultural Conversation by Stuart Isacoff

Facts: Global surface temperature rose about three-fourths of a degree Celsius in the 20th century.

FORBES: Global Warming And Global Food Security

Early in the 20th century, before the Bolshevik revolution, Russia's was the fastest-growing economy in Europe.

FORBES: How Russia Went Down A Dead End