求翻译：1974年，在陕西省临潼县晏寨公社西杨村发现了秦始皇陵兵马俑从葬坑，坑址距秦始皇陵陵园外城东城坦约1.5公里。是什么意思？

In 1974, were found in Lintong County, Shanxi province Yan Chai commune xiyangcun terracotta from the mass grave, pit location about 1.5 km from Dongcheng Temple mausoleum cemetery Park outer city.