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USresearchershavefoundtracesofanancientlakeonMarsrecent...
問題詳情:USresearchershavefoundtracesofanancientlakeonMarsrecently,increasinghopesofdiscoveringevidencethatbillionsofyearsagotheRedplanethostedlife.Thelake,whichdatesbacksome3.4billionyears,appearstoha...
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