During the farewell meeting, unbidden tears appeared as the manager thanked her retiring assistant.

在歡送會上，經理感謝即將退休的助理時，淚水不由自主地流了下來。

An unbidden smile crossed the client's face when the shipment arrived two days early.

貨物提早兩天送達時，客戶臉上不由自主地露出了笑容。

Unbidden memories of his first job returned as he interviewed nervous graduates for the internship.

他在面試緊張的應屆畢業生應徵實習時，第一份工作的回憶不由自主地浮現。