- 问题详情:Earlyonemorning,morethanahundredyearsago,anAmericaninventorcalledEliasHowefinallyfellasleep.Hehadbeenworkingallnightonthedesignofasewingmachinebuthehadrunintoaverydifficultproblem:Itseemedimpossibletogetthethreadtorunaroundtheneedlewithoutany...
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