他们给出的正式答案是中国沿袭了民国时期的地图画法和领土要求，图上的九条虚线几乎将整个南海囊括为中国领土。
The first and formal answer is that China inherited historical territorial claims, including a map from the Nationalist period that sketches a “nine-dotted line” encompassing virtually the entire South China Sea.