sight hole 观察孔 ; 窥孔 ; 视孔
A few years ago scientists were surprised by the sight of two planes carving a hole through a cloud—which then began spewing snow.
几年前，科学家对两架飞机在云中形成一个空洞，随后开始飘雪的现象很是惊异。
Over time, tides filled the hole with sand and water, creating a secluded watery Eden where determined beach bums can swim, sunbathe and kayak largely out of sight.
时间一长，潮水带来的细沙和海水覆盖了这个炸弹洞，造就了这个远离喧嚣的海上伊甸园，海滨达人在这里游泳，晒日光浴，划皮艇。
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。
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