2 sentences for 辅 (fǔ)

1. 理论与实践相辅相成。

   lǐ​lùn yǔ shí​jiàn xiāng fǔ xiāng​chéng.

   Theory and practice complement each other.

   Source: Dong Chinese Dictionary

2. 这台机器的主件和辅件都要定期检查。

   zhè tái jī​qì de zhǔ​jiàn hé fǔ jiàn dōu yào dìng​qī jiǎn​chá.

   Both the main and auxiliary parts of this machine must be inspected regularly.

   Source: Dong Chinese Dictionary