normal random noise

例句：

1. 1. The temperature is normal for this time of year.
   这个季节的温度是正常的。
2. 2.This product is designed to meet the normal standards of quality.
   该产品旨在满足正常质量标准。
3. 3.The normalcy of everyday life is often overlooked in times of crisis.
   在危机时期，日常生活的常态往往被忽视。