Assertion: leech's sucker | /r/ObjectUse | used for leverage
Facets:
Source sentences:
text: Leeches have segmented bodies (imagine "rings," like an earthworm) and suckers at both ends: one large sucker at the rear of the body, used for crawling and leverage, and a smaller sucker at the front containing the jaws and the mouth.
text: The anterior sucker consists of the teeth and jaw, which are used for feeding purpose while the posterior sucker is used for leverage.