名词
中文翻译：关键词系统
同义词：
['keyword system', 'keyword indexing', 'keyword search engine']
例句：
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1. In the digital age, key word systems are essential for SEO (search engine optimization).
在数字时代，关键词系统对于SEO至关重要。
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2. The author uses a key word system to ensure that all content is relevant and up-to-date.
作者使用关键词系统来确保所有内容都是相关且最新的。
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3. The company's new product launch will rely on a key word system to optimize its marketing efforts.
该公司的新产品开发将依赖于关键词系统来优化其市场营销努力。