![USresearchershavefoundtracesofanancientlakeonMarsrecent...]( "USresearchershavefoundtracesofanancientlakeonMarsrecent...")
- 問題詳情：USresearchershavefoundtracesofanancientlakeonMarsrecently,increasinghopesofdiscoveringevidencethatbillionsofyearsagotheRedplanethostedlife.Thelake,whichdatesbacksome3.4billionyears,appearstohavecoveredasmuchas80squaremilesandwasupto1,500feetd...
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