Assertion: swim fin | /r/HasSubevent | breakage
Facets:
Source sentences:
text: The complexities of some of these units and the requirements that the units be made of combinations of various materials or have operable mechanical elements result in swim fins or flippers which are subject to breakage, which do not operate properly at all times, are costly, and appear to be inefficient, cumbersome, and difficult to wear or use.