名词
中文翻译：肌肉的内侧
同义词：
['perineum', 'muscularis interior']
例句：
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1.The muscles of the abdomen are very important for movement.
腹部的肌肉对于运动非常重要。
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2. During childbirth, the muscles of the perineum must be strong enough to support the baby's head.
分娩期间，骨盆肌肉必须足够强壮以支撑婴儿的头部。
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3. Athletes often strengthen their perineal muscles during training to improve their performance.
运动员在训练中经常加强骨盆肌肉以提升表现。