in addition to 是一个常用的英语介词短语，表示“除……之外（还）”，相当于 besides 或 as well as。它后面通常接名词、代词或动名词（即动词的 -ing 形式）。
in addition to + 名词 / 代词 / 动名词
例句： In addition to English, she speaks French and Spanish.
翻译： 除了英语，她还会说法语和西班牙语。
例句： In addition to him, several other students failed the exam.
翻译： 除了他之外，还有几个学生考试不及格。
例句： In addition to studying, he works part-time to support himself.
翻译： 除了学习，他还兼职打工来维持生活。
in addition to 后不能直接接完整句子（即主语+谓语），如需表达类似意思，应使用 in addition（副词短语）并另起一句。additionally 或 moreover 混淆，后者用于连接两个独立句子。✅ 正确：
He plays the piano. In addition, he composes music.
❌ 错误：
In addition to he plays the piano, he composes music.