- 问题详情:Carsarelotsoffun,buttheycouldalsobehavetobecarefulwhenwedrivethemorrideinthem.It'salwaysagoodideatoputonyourseatbeltwhenyou'reina?Thinkaboutthisexample:Youputaneggonaskateboardandgiveitatheskateboardhitsastone,itwillstop,buttheeggwon'willflythr...
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