view window的用法和樣例：
例句
- There is an observation window on the hatches available for watching during operation.
檢修口上設有觀察窗，在攪拌過程中方便觀察。 - The outer door is a polyurethane foamy one with a glazing unit observation window, for better perspectivity and heat preservation.
外門為聚氨脂發泡門，中空玻璃觀察窗，透視性好，保溫性能好。
