Two things complement and promote each other; they are interdependent and mutually enhancing.
辅辅助。指两件事物互相配合，互相辅助，缺一不可。
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In a successful team, leadership and collaboration complement each other.
Learn the next connected idiom: 相辅相成 (xiāng fǔ xiāng chéng) → 成千上万 (chéng qiān shàng wàn)
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