例句與造句

1. Using the preliminary orbit calculation to predict where the object might appear on old archival images, those images ( sometimes decades old ) are searched to see if it had been in fact photographed already.
2. He has discovered numerous near-Earth asteroids, including, which briefly created a stir in the news media when a preliminary orbit calculation indicated the possibility of Earth impact in 2028; further observations led to a more accurate orbit, which disproved the impact.
3. It's difficult to find preliminary orbit calculation in a sentence. 用preliminary orbit calculation造句挺難的