stern fast

例句：

1. 1. The team is workingvery swiftly to meet the deadline.
   团队正在非常迅速地工作，以期在截止日期前完成任务。
2. 2. He was so fast thathe beat his own record by afew seconds.
   他跑得如此之快，以至于他打破了自己的记录，只差几秒钟。
3. 3. They are movingat a stern fast towards theirgoal.
   他们正以严格的速度朝着目标前进。