He found evidence of the use of child Labour and illegal working hours, along with concerns over the use of poisonous chemicals.
他发现关于雇佣童工的和不合法的工作时长的证据，还有所担心的使用毒物质。
2
It is determined by growth in the supply of Labour (the number of workers and how long they toil) along with the speed with which productivity improves.