名词
中文翻译：Unknown
同义词：
['internal forces', 'internal dynamics']
例句：
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1.The study of internal motions is crucial for understanding the behavior of materials.
研究内部运动对于理解材料的行为至关重要。
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2.In the study of internal motions, scientists have made significant progress in recent years.
在内部运动的研究中，科学家们近年来取得了重大进展。
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3.The internal motions of a material can be influenced by its structure and composition.
材料的内部运动可以受到其结构和组成的影响。