ok..friends plan to go to Yunnan of China..this is an imaginary view of high mountains..The preventive works include training to get use to high altitude, that is, take iron tablet to build up 'more blood'in our body. exercise everyday to keep fit, bring along waterproof jacket, bring good food including chocolates which contain high kilojoules, bring along Dexamethasone tablet incase any high altitude sickness, don't be shy to bring along Viagra tablet which is good for high altitude sickness and.....