9)maps. You should have a map when going to all but the most familiar places. It's not only a safety factor but can add a lot of enjoyment to your trip helping you to find the best spots and sights 10 )a good quality compass. even two might help in case the first one goes 11)a space blanket. Today it,'s an invaluable safety precaution. Weighing only 2 ounces it opens up to a full 56 X84 It reflects up to 90% of a sleeper,'s body heat while at the same time keeping out rain rain and snow What Causes altitude illnesses? 1)At sea lev The concentration of oxygen: about 21% The barometric pressure: averages 760 mmHg 2)As altitude increases, the concentration remains the same but the number of oxygen molecules per breath is reduced 3)At 12,000 feet(3, 658 meters)the barometric pressure is only 483 mmHg so there are roughly 40% fewer oxygen molecules per breath How to prevent Altitude Ilnesses? 1)If possible, don 't fly or drive to high altitude. Start below 10,000 feet(3,048 meters) and walk up 2)If you do fly or drive, do not over-exert yourself or move higher for the first 24 3)If you go above 10,000 feet(3,048 meters), only increase your altitude by 1,000 feet(305 meters) per day and for every 3, 000 feet(915 meters )of elevation gained take a rest d ay 4) Eat a high carbohydrate diet(more than 70% of your calories from carbohydrates while at altitude 5)The acclimatization process is inhibited by dehydration (zk), over-exertion(H 力过度), and alcohol and other depressant drugs(镇静药物) 6)"Climb High and sleep low. " This is the maxim used by climbers. You can climb more than 1,000 feet(305 meters) in a day as long as you come back down and sleep at a lower altitude 7) If you begin to show symptoms of moderate altitude illness, don' t go higher until symptoms decrease 8)Ifsymptoms increase, go down, down, down 22 9) maps. You should have a map when going to all but the most familiar places. It's not only a safety factor but can add a lot of enjoyment to your trip, helping you to find the best spots and sights. 10)a good quality compass. even two might help in case the first one goes berserk. 11) a space blanket. Today it's an invaluable safety precaution. Weighing only 2 ounces it opens up to a full 56"X84". It reflects up to 90% of a sleeper's body heat while at the same time keeping out rain, rain and snow. What Causes Altitude Illnesses? 1) At sea level: The concentration of oxygen: about 21% The barometric pressure: averages 760 mmHg. 2) As altitude increases, the concentration remains the same but the number of oxygen molecules per breath is reduced. 3) At 12,000 feet (3,658 meters) the barometric pressure is only 483 mmHg, so there are roughly 40% fewer oxygen molecules per breath. How to prevent Altitude Illnesses? 1) If possible, don't fly or drive to high altitude. Start below 10,000 feet (3,048 meters) and walk up. 2) If you do fly or drive, do not over-exert yourself or move higher for the first 24 hours. 3) If you go above 10,000 feet (3,048 meters), only increase your altitude by 1,000 feet (305 meters) per day and for every 3,000 feet (915 meters) of elevation gained, take a rest day. 4) Eat a high carbohydrate diet (more than 70% of your calories from carbohydrates) while at altitude. 5) The acclimatization process is inhibited by dehydration（脱水）, over-exertion（用 力过度）, and alcohol and other depressant drugs（镇静药物）. 6) "Climb High and sleep low." This is the maxim used by climbers. You can climb more than 1,000 feet (305 meters) in a day as long as you come back down and sleep at a lower altitude. 7) If you begin to show symptoms of moderate altitude illness, don't go higher until symptoms decrease 8)If symptoms increase, go down, down, down!