The key issues for bronze gnomon casting with integrated and clear surface in investment casting in plaster mold involves to prevent large plate from deformation and to ensure full mold filling.
日晷由锡青铜铸造，其铸造技术的关键是防止大平面的变形和保证良好的充型以获得完整、清晰的表面。
Sanxingdui Ruins is a key national heritage conservation units, is China's southwestern region of the Bronze age sites.
三星堆遗址属全国重点文物保护单位，是中国西南地区的青铜时代遗址。
Therefore, the study of the bronze sacrifice vessels of the middle-shang Period is a key to the sacrifice culture of Shang Period.
因此对商代中期青铜礼器的研究，是打开商代祭祀文化的一把“金钥匙”。
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