辅助 fǔzhù to assist
to assist; to aid; supplementary; auxiliary
How to remember 辅助: 辅 side road + 助 to help = to assist.
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How it is used
- To assist, or as an adjective supplementary/auxiliary - 辅助工具 (fǔzhù gōngjù) an aid/supporting tool, 辅助治疗 (fǔzhù zhìliáo) adjunct therapy.
- Marks a secondary supporting role behind the main thing, unlike 帮助 (bāngzhù) which is plain everyday helping.
- Common in tech and medical contexts: 辅助设备, 辅助功能 (accessibility features).