Assertion: mediastinum's pericardium | /r/CapableOf | cover the heart
Facets:
Source sentences:
text: The pericardium is a tough double layered fibroelastic sac which covers the heart.
text: Fibrous pericardium is the outer fibrous sac that covers the heart.
text: The pericardium is a tough double layered fibroelastic sac which covers the heart.