to reduce
quick
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→jian3su4 • jiǎnsù
slow down
slowing down, reduce speed
车辆 在 弯 道 时 应该 减速。
Vehicles should slow down on curves.
你 开 得 太 快 了， 减速！
You are driving too fast, slow down!
车子 减速 了。
The car is slowing down.