管理员摘要：
You must keep off the grass. 你必须禁止践踏草坪。 Please keep off the grass. 防止，避开，使…免受影响。 Please keep off the grass. 防止，避开，使…免受影响。……
You must keep off the grass.
你必须禁止践踏草坪。
Please keep off the grass.
防止，避开，使…免受影响。
Please keep off the grass.
防止，避开，使…免受影响。