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fulcrum (n.)
[fulcrum 词源字典]
in mechanics, "a prop, a support" (on which a lever turns), 1670s, from Latin
fulcrum
"bedpost, foot of a couch," from
fulcire
"to prop up, support" (see
balk
(n.)).
[fulcrum etymology, fulcrum origin, 英语词源]