名词
中文翻译：肌肉纤维
同义词：
['muscle fiber', 'muscle cell']
例句：
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1. Themuscles in the arms are very strong andcan lift heavy objects.
手臂的肌肉非常强壮，能举起重物。
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2. Musclecells are responsible for producing energy through contraction and relaxation of muscle fibers.
肌肉细胞负责通过收缩和放松肌肉纤维产生能量。
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3. During exercise, the heart pumps blood to the muscles, providing themwith oxygen and nutrients.
在运动时，心脏将血液泵送到肌肉，为它们提供氧气和养分。