there is a sign which said “keep___”on the doora ,out b,in c.to 求解释和答案

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there is a sign which said “keep___”on the doora ,out b,in c.to 求解释和答案
there is a sign which said “keep___”on the door
a ,out b,in c.to 求解释和答案

there is a sign which said “keep___”on the doora ,out b,in c.to 求解释和答案
out
keep out 阻止进入