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。

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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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