例文
- Another new olive drab radar with a rotating dish, called the Approach Surveillance Radar ( ASR ), was within a few hours of becoming operational.
- Sha Chau is also the site of an approach surveillance radar ( ASR ) and of a Secondary Surveillance Radar ( SSR ) for air traffic control.
- In aviation, "'approach surveillance radar "'( ASR or SRA ) is a type of radar instrument approach provided with active assistance from air traffic control.