pericardial knock

例句：

1. 1. The patient's pericardial friction rub was audible during the examination.
   在检查过程中，病人的心肌摩擦音是可闻的。
2. 2. The heart is the primary organ responsible for the function of the pericardium.
   心脏是负责心包功能的主要器官。
3. 3.The pericardium is a thin, elastic membrane that surrounds the heart and helps to protect it from injury.
   心包是围绕心脏的一层薄而有弹性的膜，有助于保护心脏免受损伤。