Inthe19thcentury,trainswerethebestwaytotravellongdistan...
問題詳情：Inthe19thcentury,trainswerethebestwaytotravellongdistances(距離)overnswerefastandconvenient.Inthe20thcentury,airplanesreplacedtrainsforlong-distancetravel.Today,however,high-speedtrainsareattr...