Vessels shall be deemed to be in sight of one another only when one can be observed visually from the other.
只有当一船能自他船以视觉看到时，才应认为两船是在互见中。
The basic principles of flight of airplanes and rockets can be visually observed through the combination of the dynamic model and multimedia images.
将动态模型与多媒体图像显示有机结合在一起，可直观地了解火箭与飞机的飞行原理。
The basic principles of flight of airplanes and rockets can be visually observed through the combination of the dynamic model and multimedia images.
将动态模型与多媒体图像显示有机结合在一起，可直观地了解火箭与飞机的飞行原理。
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