名词
中文翻译：内部纤维
同义词：
['internal fibers', 'intramuscular fibers']
例句：
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1.The muscle contraction is due to the presence of intrafusal fibers.
肌肉收缩是由于存在内部纤维。
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2. The study focused on the role of intrafusal fibers in muscle development.
该研究专注于内部纤维在肌肉发展中的作用。
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3. The researcher discovered that the intrafusal fibers play a crucial role in muscle function.
研究者发现内部纤维在肌肉功能中起着至关重要的作用。