During the Japanese invasion period, the brothers produced more than 20 animated propaganda shorts focusing on various patriotic topics from resistance against Japanese troops, opium and imperialism.
在日本入侵时期，兄弟生产了20部动画宣传短剧把焦点集中于各种爱国性抵抗，反抗日本军队, 鸦片和帝国主义。