The bulk food must be covered when selling and set up a separation to prevent the customer touching the food directly. The board "no touching" is necessary.
销售的食品必须有防尘材料遮盖，设置隔离设施以确保食品不能被消费者直接触及，并具有禁止消费者触摸的标志。
youdao
No touching allowed while watching.
只准看不准摸。
《新英汉大辞典》
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