defence communications system

例句：

1. 1. Thearmy is defending the border against invading forces.
   军队正在边境防御入侵的军队。
2. 2. The company's defence of itsintellectual property rights has been questioned.
   该公司对其知识产权的辩护受到了质疑。
3. 3. The government's defence of its economic policies wasmet with criticism.
   政府的经济发展政策遭到了批评。