相辅相成 xiāngfǔ-xiāngchéng to complement one another
(idiom) to complement one another
How to remember 相辅相成: 相 mutual + 辅 side road + 成 to become = to complement one another.
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How it is used
- Two things that complement and reinforce each other - 理论与实践相辅相成 (lǐlùn yǔ shíjiàn xiāngfǔ-xiāngchéng) theory and practice complement one another.
- Positive and mutually supportive; contrast 相反 (opposite) or 相互矛盾 (contradictory). Used to argue that two factors are both necessary.