| 标签 | 内容长度 | 内容 | 优化建议 |
|---|---|---|---|
| 标题（Title） | 59 个字符 | SIGMA Corporation of America | SIGMA Corporation of America | 一般不超过80个字符 |
| 关键词（KeyWords） | 28 个字符 | SIGMA Corporation of America | 一般不超过100个字符 |
| 描述（Description） | 272 个字符 | Sigma Corporation of America is a subsidiary of the Sigma Corporation, a Japanese based family owned manufacturer of DSLR cameras, camera lenses and camera accessories. Founded in 1961, Sigma Corporation prides itself on high quality and innovative photographic equipment | 一般不超过200个字符 |
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