envelope noise

例句：

1. 1. The new software is designed to reduce envelope noise in the system.
   新软件旨在减少系统中的包裹噪声。
2. 2.The engineer carefully wrapped up the wires before installing the new device.
   工程师在安装新设备前仔细地包裹了电线。
3. 3.The sound of the car's engine is usually the first sign of envelope noise.
   汽车发动机的声音通常是包裹噪声的第一个迹象。