heating-up period

例句：

1. 1. During the heating-up period, we need to ensure that all equipment is ready for operation.
   在加热期，我们需要确保所有设备都准备好运行。
2. 2.The team needs to take a warm-up period before starting their training session.
   团队需要在开始训练前进行热身。
3. 3. During the warming up period, the athletes are stretching and warming up their muscles.
   在预热期间，运动员们正在伸展和准备他们的肌肉。