marathon
ultra-marathon
word-class
世界一流的
toothless
annual
once a year
super-fit
身强体壮的
amateur
route
under contract
签约的
wearing rubber boots
穿着橡胶靴
harsh
prominent sponsors
重要的赞助商
might as well be invisible
仿佛隐形
test of endurance
耐力的考验
furnish with substantial support of money and equipment
提供大量的资金和设备支持
odd-looking
看起来奇怪的