Like a buck rub, a scrape is both a visual and an olfactory signal.
像雄鹿擦痕一样，雄鹿窝既是一种视觉信号，也是一种嗅觉信号。
Signal: Its visual status signals the next withdrawal or production actions.
信号：看板的可视化状态为下一步的领取操作或者生产操作作出指示。
Visual retreat signal for fire party is sent with lamp.
用灯光发布消防队视觉撤退信号。
If a whistle is not available, use the visual signal alone.
如果无口哨的话，只使用可视信号。
If a whistle is not available, use the visual signal alone.
如果无口哨的话，只使用可视信号。
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