名词
中文翻译：理论
同义词：
['theory', 'theories例句：1. Theories about the origin of life have been proposed for centuries.（关于生命起源的理论已经提出几个世纪了。）']
例句：
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1. Theories about the origin of life have been proposed for centuries.
关于生命起源的理论已经提出几个世纪了。
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2.The theory behind this phenomenon is still under debate.
这个现象背后的理论仍在争论中。
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3.Theorists often use mathematical models to explain complex phenomena.
理论家们经常使用数学模型来解释复杂的现象。