fixed clock time control

例句：

1. 1. Thefixed date for the meeting has been changed.
   会议的固定日期已经更改。
2. 2. The team's strategy is fixed and cannot bechanged easily.
   团队的策略是固定的，不容易改变。
3. 3. The weather forecast is fixed and willnot change.
   天气预报是固定的，不会改变。