形容词
中文翻译：Unknown
同义词：
['theoretical', 'theoretically']
例句：
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1. The theory of relativity is still widely accepted today.
相对论理论至今仍被广泛接受。
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2. This is a theoretical model that can be used to predict future trends.
这是一个理论模型，可以用来预测未来的发展趋势。
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3. In the study of physics, theories are often developed based on experiments and observations.
在物理学研究中，理论往往是基于实验和观察发展起来的。