60 years after his first comic book appearance, Spider-Man remains one of the world's most recognizable and beloved superheroes, thanks in large part to the excellent Sony and Marvel films ...

GIA美国宝石研究院成立于 1931 年，是全球权威的钻石、彩色宝石和珍珠研究机构。 GIA 是一个非营利的公益性机构，是宝石与珠宝知识、标准和教育的主要来源。 欢迎关注 GIA。 全球各地的学生来到 GIA 寻求知识、学习技能、获取证书，以求建立成功的宝石和珠宝 ...

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