1940年，我从重庆到西安。这是抗战第四个年头。全国的抗日战争进入了艰苦阶段，而辽阔的大西北的抗日活动却相当沉寂。“西北王”胡宗南，拥兵数十万，不仅没有同日军打过多少仗，相反却与黄河对岸的日伪军做物资买卖，大发其财。但是，在大西北却有一条看不见的战线，这就是 In 1940, I traveled from Chongqing to Xi’an. This is the fourth year of the war. The war of resistance against Japan in the country entered a difficult stage, while the anti-Japanese activities in the vast northwestern part of the country were rather quiet. Hu Zongnan, the “Northwest King,” with hundreds of thousands of his troops, not only failed to fight many battles with the Japanese army, but instead made trading with the Japanese and puppet troops on the other side of the Yellow River to make big profits. However, there is an invisible front in the Great Northwest. That is