effort
n.
late 15c., "laborious attempt, strenuous exertion," from Middle French effort, from Old French esforz "force, impetuosity, strength, power," verbal noun from esforcier "force out, exert oneself," from Vulgar Latin *exfortiare "to show strength" (source of Italian sforza), from Latin ex- "out" (see ex-) + Latin fortis "strong" (see fort).
Effort is only effort when it begins to hurt. [Ortega y Gasset, 1949]
Related: Efforts "voluntary exertion," also "result of exertion."〔李〕[ef-（ex-）=out 出；fort=force 力⇒“force out 使出力气”→] n. the use of energy；trying hard 努力；艰难的尝试
〔李〕[ef-(ex-)=out出；fort=strong, or of strength强，力量→“putting out of strength使出力气”→] n. vigorous attempt;trying hard艰难的尝试；努力