Secondary DNS servers transfer their zone information directly from the primary DNS server and keep a copy locally.
辅助DNS服务器直接从主d NS服务器传输其区域信息，并在本地保留副本。
2
The experimental results indicate that secondary air can accelerate volatile combustion in dilute phase zone and raise temperature here remarkably.
实验结果表明：二次风可以促进挥发分在稀相区的燃烧，对提升稀相区的温度作用明显；
3
Pingcha gold deposit is a Sb-Au of rich in sulphide, controlled by the E-W secondary fracture and alteration zone and being small in scal but high in grade.