中日全面战争爆发后,日军自北而南、自东向西向中国进攻,从而形成了抗日战争的第一条战线。太平洋战争爆发后,日军进攻缅甸并占领了滇西,企图形成从西南夹击中国的第二条战线。由于多种原因,日军的这种企图未能实现。 After the Sino-Japanese comprehensive war broke out, the Japanese army attacked China from the north to the south and from east to west, thus forming the first front of the anti-Japanese war. After the outbreak of the Pacific War, the Japanese attacked Burma and occupied western Yunnan in an attempt to form the second front line that struck China from the southwest. This attempt by the Japanese army failed for many reasons.