A factory worker in Engpsh can be referred to as "factory worker" or "factory operative".
The term "factory worker" comes from the word "factory" which refers to a building or group of buildings where goods are manufactured or assembled. The word "worker" refers to a person who does manual or industrial labor.
Examples:
"The factory worker was responsible for operating the machinery."
(工厂工人负责操作机器。)
"The factory workers went on strike to demand better pay and working conditions."
(工厂工人举行罢工，要求更好的工资和工作条件。)