The manager warned that infantile arguments during meetings waste everyone's valuable time.

經理警告說，會議中幼稚的爭吵會浪費大家寶貴的時間。

Several customers complained about the agent's infantile response to a simple refund request.

好幾位顧客抱怨那位客服人員對簡單的退款要求反應很幼稚。

Sending infantile emoji replies to clients can damage the firm's professional image.

用幼稚的表情符號回覆客戶，可能會損害公司的專業形象。