at once   (TTS發音)

1. very soon； immediately立刻

    The telegram must be sent at once. 電報必須立即發出。

    I recognized him at once. 我立刻就認出了他。

2. both； equally同樣；兼

    He is at once a statesman and a writer. 他既是一位政治家，也是一位作家。

    He was at once happy and sad. 他悲喜交集。

    The book is at once interesting and instructive. 這本書既有趣又有教育意義。