名词
中文翻译：用户代理
同义词：
['user-agent', 'user agent software', 'user agent server']
例句：
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1. The website uses a user agent to track user behavior.
该网站使用用户代理来跟踪用户行为。
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2. User agents are responsible for sending requests and receiving responses from servers.
用户代理负责向服务器发送请求和接收响应。
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3. The user agent is used to identify the browser and its version.
用户代理用于识别浏览器及其版本。