To monitor and control the navigation system completely, the key navigation equipment and equipment environment status of the navigation station must be monitored and controlled emphatically.
要全面监控导航系统，需要重点监控导航台的关键导航设备和设备环境状态。
The economic status was found the key factor affecting the implementation of tuberculosis control.
经济状况是影响结核病控制的主要因素。
But constrained booking only can be observed, which does not reflect actual demand status, so it is a key to estimate unconstraining demand for seat inventory control.
在收益管理中只能观测到受限的订座记录，但是它不能真实反映需求状况。估计非受限的需求是进行舱位控制的关键。
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