例句與造句

1. ;False alarm : On October 5, 1960, when Khrushchev was in New York, radar returns during moonrise at Thule produced a false alarm ( on January 20, 1961, CINCNORAD approved 2-second FPS-50 frequency hopping to eliminate reception of echoes beyond artificial satellite orbits .)
2. ;False alarms : On October 5, 1960, when Nikita Khrushchev, the Soviet Premier, was in New York, radar returns during Thule moonrise produced a false alarm ( on January 20, 1961, CINCNORAD approved 2-second FPS-50 frequency hopping to eliminate reception of echoes beyond artificial satellite orbits . ) On November 24, 1961, an AT & T operator error at their Black Forest Microwave Station northeast of Colorado Springs caused a BMEWS communications outage to the Ent AFB CC & DF and its output to Strategic Air Command ( a nearby B-52's overflight confirmed Site J had not been attacked .)
3. It's difficult to find artificial satellite orbit in a sentence. 用artificial satellite orbit造句挺難的