What radar can do in poor visibility is just find objects at sea in time, but it is not of much use for effective collision avoiding manoeuvring.
在能见度不良时，雷达虽能及时发现海上物标，但对避让操纵尚不能起很有效的作用。
The frequency stability of radar transmitter is closely related with the radar improvement factors and visibility.
雷达发射机频率稳定度严重地限制雷达改善因子和可见度。
By radar people can see things beyond the visibility of them.
利用雷达，人们可以看见视线外的东西。
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