名词
中文翻译：Unknown
同义词：
['observation slit', 'observation port', 'observation hole', 'observation slot']
例句：
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1. The astronaut used the sighting slit to check the alignment of the spacecraft's antenna.
宇航员使用观测孔来检查航天器天线的对准情况。
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2. The scientist observed the animal through the observation slit in his microscope.
科学家通过显微镜上的观测孔观察动物。
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3. The engineer made a sighting slit in the wall to create a better view of the construction site.
工程师在墙上开了一个观测孔，以便更好地观察建筑工地。