1·"We operate in five domains: air, land, sea, outer space and cyberspace," says Dan Kuehl, a professor of information operations at the National Defence University in Washington.
“我们在五大领域作战：水、陆、空、外太空和网络空间。” 华盛顿国防大学的信息作战教授丹屈尔说，“我们的工作越来越依靠网络空间；
2·Jin is the head of a strategy institute at China's National Defence University.
金是中国国防大学战略研究所所长。
3·Based on the above all, my suggestion is first: strengthening in combat, to strengthen national defence.
基于以上种种，我在建议是第一：加强战备，巩固国防。
4·It will strengthen the people's army, navy and air force, consolidate national defence, safeguard our territorial integrity and sovereignty and oppose aggression by any imperialist country.
它将加强人民的陆海空军，巩固国防，保卫领土主权完整，反对任何帝国主义国家的侵略。
5·The research of blast, combustion, armour piercing, trajectory and aviation posture can't be done without high speed photograph in national defence science and technology research field.
在国防科技研究领域，爆炸、燃烧、穿甲、弹道、飞行姿态等的研究都离不开高速摄影。