li yen is a 28—year—old worker from south—western china. she followed a family tradition of migrating thousands of miles to find better paid work. translation: it saves me from walking to every shelf to pick up the goods. now ijust had to stand at the pick—up platform to wait for the robots to send me the goods. i don't have to constantly walk here and there. they are part of a data system collecting information notjust about their environments, but also the sales patterns. understanding what sells more regularly, rearranging where products are placed, shaving off valuable minutes from overall delivery time. translation: in a traditional warehouse, it is purely manual. there are so many products, so the job for the human workers is very heavy. they could walk 50,000 steps a day. it is like finishing a marathon. here, the machines do all of that, making the work easier and more efficient. china has the largest workforce in the world but it is shrinking and rising labour costs is making it harder for logistic companies to recruit low skilled