fixed word

例句：

1. 1. The weather forecast for tomorrow is predicting a fixed temperature of 20 degrees Celsius.
   明天的天气预报预测温度为20摄氏度。
2. 2.The firm's policy on environmental sustainability has been fixed and cannot be changed.
   该公司关于环境可持续性的政策已经确定，不能更改。
3. 3. The agreement was fixed at the meeting, and it will not be altered.
   协议在会议上已确定，不会更改。