BEIJING — Dozens of Chinese-made humanoid robots showed off their fast-improving athleticism and autonomous navigation skills as they whizzed past human runners in a half-marathon race in Beijing on Sunday, highlighting the sector's rapid technical advances.Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content.The race's inaugural edition last year was riddled with mishaps, and most robots were unable to finish. Last ?year's champion robot recorded a time of 2 hours 40 minutes, more than double the time of the human winner of the conventional race.This year's contrast was stark. Not only had the number…