visibility marks

例句：

1. 1.The company uses visibility marks to indicate the location of its products on shelves.
   该公司使用可见标记来指示其产品在货架上的位置。
2. 2. The police tape off the area with visibility marks to prevent trespassing.
   警方用可见标记将区域封锁，以防止非法入侵。
3. 3.The visibility marks are clearly marked so that customers can easily find their way around the store.
   可见标记清晰标记，以便顾客轻松找到商店的路线。