PLL

例句：

1. 1.The PLL is the only way for us to communicate with each other.
   个人线路是我们彼此沟通的唯一方式。
2. 2. We need a private line to ensure confidentiality.
   我们需要一个私人线路来确保保密性。
3. 3. The PLL was established to provide faster and more reliable service.
   个人线路的建立是为了提供更快、更可靠的服务。