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没有这个词形变化的！！n. 增加，附加物，加法【词形变化】 形容词: additional 副词: addi-tionally 【词源解说】 14世纪中期进入英语，直接源自古法语的addition；最初源自拉丁语的additiionem，意为增加。【语法用法】 in addition to意为“加在…上”或“不但…”，其中to是介词，在这不代表不定式，因此用in addition to doing this,而不是in addition to do this。【词义辨析】 addition, appendix, attachment, supplement, accessory这些名词均含“附加物、增加物”之意。addition: 仅强调数量的增加。appendix: 指书末的附录。attachment: 指用于扩大原物用途的附件。supplement: 主要指使书、报等正文更完善而额外增加的部分。accessory: 作“附件”解时，与attachment同义，可互换，但还指增加美观的附属品。英英解释：名词 addition:a component that is added to something to improve it同义词：addition, add-on, improverthe act of adding one thing to another同义词：additiona quantity that is added同义词：addition, increase, gainsomething added to what you already have同义词：accession, additiona suburban area laid out in streets and lots for a future residential area同义词：additionthe arithmetic operation of summing; calculating the sum of two or more numbers同义词：summation, addition, plus
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Addition of此外，addition 英[əˈdɪʃn] 美[əˈdɪʃən] n. 加，增加，附加; [数] 加法; 增加的人或事物; [网络] 增补; 加; 添加; [例句]Part-time English classes are offered. In addition, students can take classes in word-processing and computing.开设了非全日制的英语班。另外，学生可以修读文字处理和计算机课程。[其他] 复数：additions 形近词： extradition edition sedition
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add something to.../increase/mix something with...把…加上…/ 增加 /把…与…混合append 添加；附加语境不同，就会有不同的语言表达
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