supplement

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。

名词 supplement:

1. textual matter that is added onto a publication; usually at the end
   同义词：addendum, postscript
2. a quantity added (e.g. to make up for a deficiency)
   同义词：supplementation
3. a supplementary component that improves capability
   同义词：accessory, appurtenance, add-on

动词 supplement:

1. add as a supplement to what seems insufficient
2. serve as a supplement to
3. add to the very end
   同义词：append, add on, affix

1. She gives private lessons to supplement her income.
   她给私人授课以贴补收入。
2. I never refuse odd jobs to supplement my income it's all grist to the mill.
   我为增加收入，对於做零活总是来者不拒--多多益善。
3. I supplement my grant by working in the evenings.
   我除享受助学金外还打夜工以增加收入。
4. She supplements her diet with vitamin tablets.
   她服用维生素片剂以补充规定食谱中的营养。
5. The money I got was a useful supplement to my ordinary income.
   我得到的那笔钱是很管用的外快。
6. I supplement my scholarship by working in the evening.
   我除了享受奖学金外还打夜工以增加收入。