1. Her behavior at the party was quite immature.
她在派对上的行为相当幼稚。

2. It's important to be patient with children when they display immature behavior.
当孩子展现出幼稚行为时，耐心是非常重要的。

3. The company decided not to hire him because they felt he had an immature attitude towards work.
公司决定不雇佣他，因为他在工作态度上表现出幼稚。