The eight-day exercise is being held in the South China Sea, where both navies will conduct maritime surveillance, air defense and anti-submarine warfare exercises.
为期八天的演习正在南海举行，双方的海军都将进行海上监视，防空和反潜战演习。
2
Monitoring stations in many cities were ordered to conduct around-the-clock surveillance of radioactive substances in the air and sea water.
许多城市的监测站受命对空气和海水中的放射性物质进行全天监测。
3
Two years ago America complained when Chinese vessels harassed a surveillance ship, the USNS Impeccable, in the south China Sea south of the Chinese island-province of Hainan.