to reduce
quick
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→jian3su4 • jiǎnsù
slow down
slowing down, reduce speed
車輛 在 彎 道 時 應該 減速。
Vehicles should slow down on curves.
你 開 得 太 快 了, 減速!
You are driving too fast, slow down!
車子 減速 了。
The car is slowing down.