減低速度

to retard / to decelerate

to lower / to decrease / to reduce / to subtract / to diminish

to lower / to reduce

low / beneath / to lower (one's head) / to let droop / to hang down / to incline

fast / rapid / quick / velocity

speed / rate / velocity / (music) tempo / CL:個|个[ge4]

to pass / to spend (time) / measure / limit / extent / degree of intensity / degree (angles, temperature etc) / kilowatt-hour / classifier for events and occurrences

to estimate / Taiwan pr. [duo4]