Dr Wu Lien-teh (standing left in the deep burrow) and his staff exploring a new burrow on August 21st 1911 near Manchouli; note the burrow's great depth 1911年8月21日,伍連德醫生 (站在深坑左邊) 和他的團隊在滿洲里勘察一個深度挖開的旱獺地洞

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