Tea was relatively expensive until Britain started a direct trade with China in the early 18th century.

在18世纪早期英国与中国开始直接贸易之前，茶叶相对昂贵。

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In the early 20th century, few things were more appealing than the promise of scientific knowledge.

在20世纪初，很少有东西比科学知识的承诺更吸引人的了。

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Milankovitch proposed in the early twentieth century that the ice ages were caused by variations in the Earth's orbit around the Sun.

米兰科维奇在20世纪早期提出，冰河时代是由地球绕太阳运行轨道的变化引起的。

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In the early nineteenth century steamboats came from the city of Philadelphia,Pennsylvania and from the nearby state of Delaware.

VOA: special.2009.06.01

But the question is how are those of us of this generation, living that ethic out in the early 21st century?

但问题是,我们这代人如何，将在21世纪初的生活中体现这一道德？

普林斯顿公开课 - 人性课程节选

And why I'm hesitating is, in the early days of the 20th century, the Nobels were first given in 1901.

让我犹豫的是，在20世纪的早期，诺贝尔奖在1901年才开始颁发。

麻省理工公开课 - 固态化学导论课程节选

Cosimo I de' Medici, then the second duke of Florence, purchased the Palazzo Pitti in 1549, and up until the completion of Versailles in Paris in the early 18th Century, Palazzo Pitti was considered the most opulent palace in Europe.

BBC: Florence��s best-kept secret

In the world of music in the early 21st century, The Rolling Stones make an easy target.

NPR: The Stones Defiant: 'A Bigger Bang'

The center was in a big bleak house built in the early nineteenth century, isolated in a dip in the middle of the moors, beside a river.

NEWYORKER: She��s the One