Now one of the challenges of going up to altitude is when you get to 30,000 feet -- it's great, isn't it? -- When you get to 30,000 feet you can really only use oxygen.
Jedan od izazova putovanja u visine je kad stignete do 9.144 metara --  super, zar ne? -- Kada stignete do 9.144 metara visine  možete korisititi kisik za disanje.