最終更新日：2024/08/08
The heart sac, also known as the pericardium, protects the heart from external damage.
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The heart sac, also known as the pericardium, protects the heart from external damage.
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The heart sac, also known as the pericardium, protects the heart from external damage.
The heart sac, also known as the pericardium, protects the heart from external damage.
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