名词
中文翻译：Unknown
同义词：
['nucleus', 'nuclei', 'core']
例句：
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1. The atomic structure of the element is determined by its nucleus.
元素的原子结构由其核心决定。
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2. The core of the Earth is made up of molten iron and nickel.
地球的核心由熔化的铁和镍组成。
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3. The study of atomic physics is crucial for understanding the structure of matter.
研究原子物理学对于理解物质的结构至关重要。