expression
not only ... (but also); not just; as well as
Used to add information, often followed by ～も or ～さえ. Connects nouns, verbs, and adjectives.
彼は日本語だけでなく英語も話せる。
He can speak not only Japanese but also English.
この店は安いだけでなく、品質も良い。
This store is not only cheap, but the quality is also good.