Meaning of sù:
sù
速
Adjective
fast; rapid; quick
Tā pǎo de hěn sù.
他跑得很速。
He runs very fast.
Tā de fǎnyìng hěn sù.
他的反应很速。
His reaction was very rapid.
Tā de fǎnyìng fēicháng sù.
她的反应非常速。
Her reaction is very quick.
Noun
velocity
Huǒchē de xíngshǐ sùdù fēicháng kuài.
火车的行驶速度非常快。
The train's velocity is very fast.
