fl.

例句：

1. 1.The flight was delayed due to the heavy fog.
   由于浓雾，航班延误了。
2. 2.The fish swam in the lake, forgetting all about the fl.
   鱼在湖里游着，忘记了所有的烦恼。
3. 3.The flowers bloomed beautifully in the spring, but the fl. remained hidden.
   春天花朵盛开得非常美丽，但烦恼依然隐藏。