| 摘要 |
PURPOSE: A turning window is provided to secure a wide view field by removing a motor from a turning window and to prevent the separation of the motor due to the shock of wave. CONSTITUTION: Without a motor, view field is not limited and the danger of the separation of a motor due to shock of wave is removed. A turning window is formed in hemisphere, thus the wave rushing to the turning window is dispersed. The pressure of the wave is decreased and safety is promoted. By surrounding the turning window with another window, the seawater doesn't flow into a ship.
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