例句與造句

1. Radar echoes include echoes of lands , islands , all kinds of moving targets , racon , sart and sea , etc . arpa marks consist of fixed range marker , variable range marker , electronic bearing line , guard zone , heading - line , parallel index ( 4 navigation lines ) , vector lines ( or pad ) and past track information of tracked target ships , marks of trial manoeuvres , ect
   雷達(dá)回波包括陸地、島嶼回波，各種活動(dòng)目標(biāo)的回波，雷康、 sart回波，海雜波等。 arpa符號(hào)包括包括固定距標(biāo)圈、活動(dòng)距標(biāo)圈、電子方位線、警戒圈、船首線、 pi線、已錄取目標(biāo)的矢量線以及歷史航跡(或pad ) 、試操船符號(hào)等。
2. It's difficult to find vector line in a sentence. 用vector line造句挺難的