To unify the magnetic field level of the whole area in Marine geomagnetism surveying, the base value of the secondary base station must be reduced to the main base value.
海洋磁力测量多站日变改正中，为了使整个测区磁场水平统一，必须以主站为基准对分站日变基值进行归算。
Thermal Power Station is the second net heat source, the main energy-consuming device is a heat exchanger, circulating pump and fill the secondary network of pumps.
热力站是二级网热源，主要耗能设备是换热器、二级网循环水泵和补水泵。
The main lobby connects via escalators to a secondary office lobby located at the lower basement level, which in turn allows access to below ground retail and the subway station.
主要大堂通过自动扶梯连接着位于大厦地下楼层的辅助办公大堂，从而为通往地下零售设施和地铁站提供了通道。
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