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1·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。

2·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。

3·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。

4·In the 20th century, first it was the movies, then radio, then television that seemed to spell doom for the written world.

在20世纪，先是电影，然后是收音机，再然后是电视机，似乎都给书面世界带来了灭顶之灾。

5·Elves, goblins, and trolls seem to be the timeless creations of the distant past, but gremlins were born in the 20th century.

精灵、小妖精和侏儒似乎是远古时代永恒的产物，但小妖精诞生于20世纪。

6·Carson Maulers is a wunderkind in the 20th century of American literary history.

卡森·麦卡勒斯是二十世纪美国文学史上一位神童。

7·Associate professor yu xiuying's research achievements have formed a feature in the 20th century parleyvoo.

于秀英副教授的研究成果在20世纪法国语言学流派方面已经形成特色。

8·It was tried in the 20th century.

它开始试验于20世纪。

9·Tobacco caused 100 million deaths in the 20th century.

二十世纪中烟草导致了1亿人死亡。

10·In the 20th century, dogs' duties became more diverse.

在二十世纪，军犬的职责更为多样化。