Tasking under the joint urgent operational need includes installing BACN on two Bombardier BD-700 Global Express aircraft and two Global Hawk Block 20 unmanned aerial vehicles.
联合紧急业务需求订单包括在两架庞巴迪BD-700全球快车飞机和两架20座全球鹰无人机上安装战场机载通信节点（BACN）。
Researchers say the giant planet, named BD+20 1790b, is 35 million years old and six times the mass of Jupiter.
研究人员称，这颗名叫BD+20 1790b的巨大行星年龄有3500万年，体积是木星的六倍。
An optical storage medium (20) comprises a first data layer (21), for example a Blu-ray (BD) data layer.
一种光学存储介质(20)包括第一数据层(21)，例如BD数据层。
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