addition的形容词形式：additional adj.附加的；额外的；外加的；
派生词： additionally adv.
addition：n. 加；加法；增加物；添加物；增加；添加；
复数： additions
相关介绍
This plywood addition helps to strengthen the structure.
多层胶合板有助于加固结构。
The final chapter is no more than a scrappy addition.
最后一章不过是一些支离破碎的补充内容。
Additional cream would make it too rich.
再加奶油会让它过于油腻。
The US is sending additional troops to the region.
美国正向该地区增兵。
