迅速 (xùn sù) means “rapid; speedy; fast”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
消防队接到报警后迅速赶到现场救援扑灭大火。
Xiāofángduì jiēdào bàojǐng hòu xùnsù gǎndào xiànchǎng jiùyuán pūmiè dàhuǒ.
The fire department quickly rushed to the scene to rescue and extinguish the fire after receiving the alarm.
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