Before giving them rewards, companies need to train their workforce and identify their potential.

workforce 是复合名词，由 work（工作）和 force（力量、队伍）组成。work 指"工作"，force 在这里指"人员、队伍"。 workforce 合起来指"劳动力、员工队伍"，即一个公司或组织中所有从事工作的员工。