(idiom) to complement one another
相 · 9 strokes
Depicts an eye (目) looking at a tree (木). Based on the original meaning "look at". The meaning of this character has shifted over time to "compare" and "each other".
辅 · 11 strokes
Phonosemantic compound. 车 represents the meaning and 甫 represents the sound. Simplified form of 輔.
相 · 9 strokes
Depicts an eye (目) looking at a tree (木). Based on the original meaning "look at". The meaning of this character has shifted over time to "compare" and "each other".
成 · 6 strokes
Depicts defending city walls (丁) with an axe (戌). 丁 also represents the sound. Based on the original meaning "city", now written as 城. The current meaning is a phonetic loan.
理论学习和实践经验相辅相成，缺一不可。
Theoretical study and practical experience complement each other; neither can be omitted.