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Supplementary things are added to something in order to improve it.
extra , additional
the question of whether or not we need to take supplementary vitamins.
我们是否需要补充维生素的问题。
Provide them with additional background or with supplementary information.
向他们提供其他背景资料或补充信息。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。