The preposition beside usually means 'next to something/somebody' or 'at the side of something/somebody'.介词 beside 通常表示靠近、在旁边：◆Sit here beside me.坐到我旁边来。The preposition besides means 'in addition to something'.介词 besides 表示除…之外（还）：◆What other sports do you play besides hockey?除了玩曲棍球你还做哪些运动？Do not use beside with this meaning.此义不用 beside。
The adverb besides is not usually used on its own with the same meaning as the preposition. It is mainly used to give another reason or argument for something. * besides 作副词单独使用时通常与作介词时的含义不同，主要用以提出另一理由或论据：◆I don't think I'll come on Saturday. I have a lot of work to do. Besides, I don't really like parties.我想我星期六不会来。我有好多事要做。再说，我不太喜欢社交聚会。◆She likes football. Besides, she likes tennis and basketball.
