例句與造句

1. A ssr can provide more useful information than primary surveillance radar ( psr ) but is subject to the proper functioning of the aircraft s transponder
   二次監(jiān)察雷達較一次監(jiān)察雷達能提供更多有用的資料，但須依賴航機上應(yīng)答器之正常運作。
2. For more than 25 years , the old radar served as a primary surveillance radar ( psr ) with coverage of 200 nautical miles for en - route air traffic surveillance . it is necessary to replace the old radar because of its age and difficulty in acquiring spares
   運作逾二十五年的舊雷達為一支監(jiān)察雷達，具備二百海里以內(nèi)航空交通航路監(jiān)察功能。由于舊雷達老化，及采購該雷達的零件亦十分困難，故有需要進行更換。
3. It's difficult to find primary surveillance radar (psr) in a sentence. 用primary surveillance radar (psr)造句挺難的