19世纪40年代期间，马克思和恩格斯一起写了一本书。

During the 1840s, Marx and Engels wrote a book together.

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美国国家冰雪数据中心（NSIDC）位于科罗拉多州，其主任马克·塞雷泽（Mark Serreze）认为，随着我们进入21世纪，海平面上升将成为一个越来越大的问题。

Mark Serreze, director of the American National Snow and Ice Data Center (NSIDC) in Colorado, thinks that sea level rise is going to be a bigger and bigger problem, as we move through the 21st century.

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1902年，新圣马克钟楼在16世纪建成的老圣马克钟楼倒塌后出现。

The bell tower was built after the existing 16th century structure collapsed in 1902.

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