fixed echo suppressor

例句：

1. 1. The team's fixed strategy proved to be effective in the game.
   团队的固定策略在比赛中证明是有效的。
2. 2. The weather has been fixed since yesterday.
   天气从昨天起就固定了。
3. 3. The company's fixed price is a good deal for customers.
   公司定的价格对顾客来说是一笔好交易。