名词
中文翻译：心脏囊
同义词：
['cardiac sac', 'cardiac cavity', 'heart cavity']
例句：
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1. The heart-sac is where the heart is protected from the outside world.
心脏囊是心脏免受外界侵害的地方。
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2. During surgery, the surgeon carefully removes the heart-sac to access the heart.
在手术中，外科医生小心地移除心脏囊以接触心脏。
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3. The heart-sac plays a crucial role in regulating blood flow and maintaining proper functioning of the heart.
心脏囊在调节血流和保持心脏正常功能方面起着至关重要的作用。