They began to provide a form of air traffic control based on visual signals.
他们开始提供一套以目视信号为基础的空中交通管制。
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。
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。
应用推荐