This could be said to be the least popular topic within the already un popular discipline of Chinese historical geography, which is why in addition to his command of English and French, Hibino Takeo is also able to converse in Manchu, Mongol and Russian.
這在中國歷史地理學中，可說是冷門中的冷門，為此日比野除了精通英、法文，也能說滿、蒙、俄語。