selective service system

例句：

1. 1.The selective service system is a mandatory requirement for all citizens to register with the government.
   选择性服务系统是所有公民必须向政府登记的强制性要求。
2. 2. The selective service system helps to ensure that only eligible individuals are allowed to serve in the military.
   选择性服务系统有助于确保只有符合条件的个体被允许参军。
3. 3.The selective service system has been criticized for its high cost and potential biases in recruiting.
   选择性服务系统因其高昂的费用和潜在的招募偏见而受到批评。