Down，Slowdown，英语是减速
减速 [词典] decelerate; moderate; reduce the speed; shift down; speed reduction; [例句]路很滑，你最好减速。The road is slippery; you'd better slow down.
减速slowdown超速overspeed
slow down 减速
decelerate accelerate
减速 v. slow down, decelerate, retard
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