研究開発
Categories:
- Japanese terms spelled with 研 read as けん
- Japanese terms spelled with 究 read as きゅう
- Japanese terms spelled with 開 read as かい
- Japanese terms spelled with 発 read as はつ
- Japanese terms read with on'yomi
- Japanese lemmas
- Japanese nouns
- Japanese terms spelled with third grade kanji
- Japanese terms written with four Han script characters