基数词
中文翻译：十九
同义词：
['twelfth', 'twelfth例句：1. The 19th century was a time of great change in the world.（19世纪是世界上发生巨大变化的时期。）']
例句：
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1. The 19th century was a time of great change in the world.
19世纪是世界上发生巨大变化的时期。
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2. We need to find the 19th number in this sequence.
我们需要找到这个序列中的第19个数。
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3.In the 19th century, there were many inventions that changed our lives.
在19世纪，有许多发明改变了我们的生活。