It's no mystery why: Volkswagen has calculated that its robots work for less than $6 an hour, with all costs figured in, compared with $47 an hour in total costs for a human worker.

大众汽车计算出，其机器人每小时的工作成本不到6美元，所有成本都计入在内，人类工人每小时的总成本为47美元。