sight 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(guān)察窗，在攪拌過(guò)程中方便觀(guān)察。 - The outer door is a polyurethane foamy one with a glazing unit observation window, for better perspectivity and heat preservation.
外門(mén)為聚氨脂發(fā)泡門(mén)，中空玻璃觀(guān)察窗，透視性好，保溫性能好。
