- 问题详情: Thereisnotenoughoilintheworldnow.Astimegoesby,itbecomeslessandless,sowhatarewegoingtodowhenitrunsout?Perhapswewillgobacktousehorses,carriagesandbicycles. IntheSecondWorldWar,somepeopledidn'tusegasmadefrompetroleum(石油)intheircarsmadegasfromw...
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