Stopreadingforaminuteandthinkaboutwhatyouseewhenyoulook...
問題詳情：Stopreadingforaminuteandthinkaboutwhatyouseewhenyoulookupattheskyonaclearnight.Youprobablyseemanystars.Longlongago,farmerswatchedsomestarstoknowwhentoplanttheircrops.Travellersdidsotofindtheir...