標(ひょう)高(こう) hyoukouが gaぐんと gunto高(たか)く() takakuなる naruと to呼(こ)吸(きゅう)困(こん)難(なん) kokyuukonnanを o感(かん)じ()る() kanjiru。 At very high altitudes, you feel difficulty breathing. bodyhealthscience~と (conditional)state mimetic (擬態語)ぐんと (sharply, steeply)