WordNet

failing to accomplish an intended result; "an abortive revolt"; "a stillborn plot to assassinate the President" (同)stillborn, unsuccessful
work hard; "She was digging away at her math homework"; "Lexicographers drudge all day long" (同)labour, toil, fag, travail, grind, drudge, dig, moil
undergo the efforts of childbirth (同)labour
productive work (especially physical work done for wages); "his labor did not require a great deal of skill" (同)labour, toil
a social class comprising those who do manual labor or work for wages; "there is a shortage of skilled labor in this field" (同)labour, working_class, proletariat
a workplace for the conduct of scientific research (同)laboratory, research lab, research laboratory, science lab, science laboratory
lacking natural ease; "a labored style of debating" (同)laboured, strained

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/12/11 10:36:37」(JST)

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Journal of clinical medicine research.J Clin Med Res.2015 Feb;7(2):97-102. Epub 2014 Nov 19.
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Mendola P1, Mumford SL, Männistö TI, Holston A, Reddy UM, Laughon SK.
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