Secondly, to do so would have taken at least two years, and the museum could not wait. But most seriously, bronze is too heavy. Just the equatorial ring of the celestial globe would have weighed over 200 kg.
此外，翻成銅，至少費時兩年，科博館不能等；最嚴重的是，銅太重，光是一個渾象上的赤道環，就兩百多公斤。