而且这些区域的解析表达式一般无法求解，是电子战作战态势分析中的难点。

Also their resolution equation could not be got. So drawing them is difficult.

youdao

而且这些区域的解析表达式一般无法求解，是电子战作战态势分析中的难点。

Also their resolution equation could not be got. So drawing them is difficult.

youdao