HSK 4
快速
kuàisù形
fast; high-speed; rapid
请快速走到教室门口。
Qǐng kuài sù zǒu dào jiào shì mén kǒu.
Please walk quickly to the classroom door.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.