sight hole

英 [saɪt həʊl]

美 [saɪt hoʊl]

网络观察孔; 瞄准孔

At first sight it might seem that all electrons which pass through the hole will have the same energy.
初看起来，似乎所有通过小孔的电子都会具有相同的能量。
Glowing dots naturally gathers light to surround peep sight hole allowing huner to visually locate and center peep in dim light.
发光点利用自然光包围窥孔的方式使窥孔产生高亮，达到射手在昏暗的光线中超清晰的使用。
Causes and prevention of boiler sight hole leakage
锅炉检查孔泄漏的原因及预防
The fracture phenomenon and spalling time of the test piece can be observed continuously through a sight hole.
通过窥视孔可连续观察试件表面的脱皮现象和得出激热开裂时间。
The major causes of boiler sight hole leakage are analyzed in terms of forces borne, geometric sizes and insulation spacers, and measures to be taken to prevent leakage are also given, on the basis of many years 'practice.
根据多年的实践，从受力、几何尺寸、垫料等方面分析了锅炉检查孔发生泄漏的主要原因，并提出了预防泄漏的措施。