前缀
中文翻译：副的
同义词：
['secondary', 'tertiary']
例句：
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1. The subway is the fastest way to travel between downtown and the airport.
地铁是连接市中心和机场最快的交通方式。
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2. The subtitles are for those who cannot watch the movie in English.
字幕是为那些不能看原版电影的人准备的。
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3. The subreddit has thousands of subscribers, but only a few thousand posts.
这个子论坛有数千名订阅者，但只有几千条帖子。