达达派的作品在二十世纪初非常流行。

Dadaistic artwork was very popular at the beginning of the twentieth century.

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在二十世纪初的时候。

During the early 20th century.

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在二十世纪初，全世界的人口大约是十七亿。

At the beginning of the twentieth century, the world's population was about 1,700 million.

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在二十世纪初，全世界的人口大约是十七亿。

At the beginning of the twentieth century, the world's population was about 1,700 million.

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