If there's a severe pericardial effusion, a pericardiocentesis can be done by inserting a needle into the pericardial cavity and draining the excess fluid.

严重包积液可行包穿，即借助穿针包腔，吸除多余积液。

When the pericardium is involved, it often leads to pericarditis —inflammation of the pericardium— and pericardial effusion, an accumulation of fluid in the pericardial cavity.

当转移包时，通常会导致包炎，即包引起的炎症，并引起包积液，即在包腔内积聚液体。

The inner layer of the pouch is the serous pericardium that includes the pericardial cavity, and is filled with a small amount of fluid that lets the heart slip around as it beats.

包的内层是浆膜包，包括包腔；包腔内含有少量液体，在脏跳动时起润滑作用。

The cells of the serous pericardium secrete and reabsorb the fluid, so usually there's no more than 50 milliliters of fluid in the pericardial cavity at one time - that's about as much as a shot glass.

浆膜包分泌和吸收液体，包腔内的液体含量正常不超过50毫升，相当于一小杯酒的液体量。