波罗的海海运贸易交易所
Baltic Mercantile and Shipping Exchange
对外贸易交易
foreign trade transaction
Alamouti正交空时码
Alamouti orthogonal space time code
把土地腾空交出
vacant possession of land
参数型非空交定理
parametric type non-empty intersection theorems
超正交空时格码
super-orthogonal space-time trellis codes
超正交空时码
super-orthogonal space-time code
大跨杂交空间结构
long-span space hybrid-structure
倒易空间Mapping
Reciprocal space mappings
低空空投
low-altitude extraction (LAE