相辅相成

面对复杂多变的外部环境，我们做事必须做到相辅相成。

miàn duì fù zá duō biàn de wài bù huán jìng, wǒ men zuò shì bì xū zuò dào xiāng fǔ xiāng chéng.

Faced with a complex and ever-changing external environment, we must work in harmony.

理论学习与社会实践相辅相成，二者缺一不可。

lǐ lùn xué xí yǔ shè huì shí jiàn xiāng fǔ xiāng chéng, èr zhě quē yī bù kě.

Theoretical study and social practice complement each other and both are indispensable.