Because the internship allows the employer to base their hiring decision on an actual work sample instead of a series of interviews, and the employer does not have to make that permanent hiring decision until the internship period is over.
因为这种实习可以让雇主 基于参与者实际工作成效 来做出雇佣决策， 而非一系列的面试， 而且雇主不必在实习结束之前 就做出永久雇佣的决定。