自十九世纪以来，一直能在英国看到这个品种。

This breed has been seen in Great Britain since the 19th Century and is a descendant of the ancient fighting cocks.

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概括了自十九世纪以来经典物理学所取得的重大成就，并回顾了玻尔理论的建立背景，阐述了玻尔理论的基本原理。

This article describes the great achievements of classical physics in the 19th century. The background of Bohr's theory and the fundamental principle of this theory.

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哈佛大学自十九世纪以来始终坚持学术自由理念，营造了一个良好的学术氛围，这是哈佛大学取得成功的一个重要原因。

Harvard University has insisted on the idea of academic freedom since nineteenth century, thus has created a suitable atmosphere for prosperity of academy.

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