Assertion: sacrum's opening | /r/CapableOf | pierce pelvic floor
Facets:
Source sentences:
text: The pelvic floor has two inherently conflicting functions: One is to close the pelvic and abdominal cavities and bear the load of the visceral organs; the other is to control the openings of the rectum and urogenital organs that pierce the pelvic floor and make it weaker.