- 开心 開心 adjectivehappyTo feel happy; to rejoice; to have a great time.
- 丸 nounaffixball(bound form) small, round object; pellet; pill; bolus
- 儿 兒 particleaffix[erhua suffix]A suffix attached to a word to form a retroflex ending, often indicating a small size, a sense of familiarity, or turning a word into a noun.