This is the 451st most frequent Chinese word.
迅速
Rapid; swift.
迅速 is used as an adverb to describe the speed of taking action, emphasizing the need for promptness.
我们需要迅速采取行动，以应对紧急情况。
We need to take swift action to respond to the emergency.
迅速 is used as an adjective modifying 'development', stressing the high speed of the process.
科技的迅速发展改变了我们的生活方式。
The rapid development of technology has changed our lifestyle.
迅速 is used as an adverb to highlight the quickness with which the task was done, showcasing efficiency.