秦始皇帝陵博物院文物修復專家蘭德省（右一）在指導技術人員運用超聲波儀器測量秦俑胎體的密度（8月23日攝）。[新華社記者 王毓國 攝]

Lan Desheng (1st, R) guides technicians to measure the density of the painted Terracotta Warriors with an ultrasonic device at the Emperor Qinshihuang's Mausoleum Site Museum in Xi'an, northwest China's Shaanxi Province, Aug. 23, 2023. (Xinhua/Wang Yuguo)