结合广州航空邮件处理中心风洞试验，研究了开孔大跨屋盖结构的内部风效应。
Wind tunnel test of Guangzhou air-mail processing center was carried out to investigate the internal wind effect for long-span roof structure with openings.
主要介绍露天深孔大梯段预裂爆破、减震爆破、微差爆破、最大一次装药量的控制措施和关系。
The relationship between the pre-splitting, vibration reduction, millisecond blasting and the maximum single detonating charge in open deep-hole large stage is introduced.
举个例子，它们在眼睛前面都有一个大孔；这种孔只会在这类物种上看到，但不会出现在其他鸟类身上。
For example, both have a large hole in front of the eye; this big hole is only seen in these species and is not present in any other birds.
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