| 词汇 | metallicity | 
| 释义 | metallicity  noun [ C or U ]  physics specialized uk/ˌmet.əlˈɪ.sə.ti/ us/ˌmet̬.əlˈɪ.sə.t̬i/  金属量(星体内除氢和氦元素外其他化学元素的比例) the amount of material that is not helium or hydrogen in a star, planet, etc.  20 to 30% of sun-like stars with large metallicities are known to have planets. 已知有20%到30%的具有大金属丰度的类太阳恒星都有自己的行星。   Compared to the Sun, 47 Tucanae has less than a third the metallicity.  与太阳相比,杜鹃座47的金属丰度不到1/3。  
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