swift electron

例句：

1. 1. The swift river flows through the forest.
   湍急的河流穿过森林。
2. 2. The swift bird flew away before I could see it clearly.
   那只鸟飞得很快，我还没看清楚就飞走了。
3. 3. Swift action can save lives in emergencies.
   在紧急情况下，迅速的行动可以挽救生命。