Since the 20th century, urbanization has become a global trend.

20世纪以来，城市化成为世界性的潮流。

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The evaluation of art has become especially problematic since the 20th century.

艺术的评价已经成为问题，因为特别是在20世纪。

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Since the 20th century, public art has been continuously evolving in its form and function.

公共艺术在20世纪以来，形式和功能不断地发生演变。

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"We are done." Before he signed the bill, Mr.Obama paid tribute to all who fought for health reform since the early 20th century.

VOA: standard.2010.03.23

Since the early 20th century, women were told that breast milk alternatives were the modern, scientific, superior and American way to go.

CNN: Breastfeeding is intuitive and easy? No!

Globally, glaciers have been retreating since the early 20th Century, with a few exceptions.

BBC: Massive melting of Andes glaciers

But the animal has received little reverence from man since the turn of the 20th Century.

BBC: Brazil��s land of the jaguar