USresearchershavefoundtracesofanancientlakeonMarsrecent...
问题详情:USresearchershavefoundtracesofanancientlakeonMarsrecently,increasinghopesofdiscoveringevidencethatbillionsofyearsagotheRedplanethostedlife.Thelake,whichdatesbacksome3.4billionyears,appearstoha...