Warning: file_put_contents(): Only 0 of 5114 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/oclz.com/index.php on line 55 gemology例句_gemology英汉例句_gemology双解例句_菜篮子兴趣思朗文词典
Many jewelers also study gemology in order to become familiar with the physical properties of the gem stones with which they work. 一些珠宝工艺人员出于更好的了解他们加工的宝石的特性也钻研宝石学。