endurance - a test of human ...; beyond ..., endeavour  - ... to do something never attempted before; ...ed in vain , mission - a peace/rescue/fact-finding ...; its ... is to, hypothesis - test the ...; several ...es for global warming; the ... has been suggested, trek - ... up that hill; went ...king in Nepal, circumnavigate - ... Cape Horn Island in canoes; ... the world on a bike, launch - the ... of the space rocket, boundary - push the ... of our knowledge; blur the ... between, motivate - lack ...; ... to succeed, thrill - the ... of being the first; gave me a real ... to see, map - ... the world; an unexplored region that has not yet been ...ped , seek - ... fame/fortune; ... jobs, settlement - establish ...; the ... of the American West, network - set up ...; ... of tunnels; a road/rail ...; trading ...,

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