![Therehavebeenmanygreatinventionsorthingsthatchangedthew...]( "Therehavebeenmanygreatinventionsorthingsthatchangedthew...")
- 问题详情：Therehavebeenmanygreatinventionsorthingsthatchangedthewaywefirstgreatinventionwastheonethatisstillveryimportanttoday—themadeiteasiertocarryheavythingsandtotravellongdistance.Forhundredsofyearsafterthattherewerefewinventionsthathadasmucheffec...
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