Tous,itseemssonaturaltoputupanumbrellatokeepthewateroff...
问题详情：Tous,itseemssonaturaltoputupanumbrellatokeepthewateroffwhenitrains.Butinfacttheumbrellawasnotinventedasprotectionagainsttherain.Itsfirstusewasasashade(遮蔽)againstthesun. Nobodyknowswhofi...