at once
成語所屬單字once
at once — 慣用語
1. without waiting, or with several things happening together, depending on the sen
1.慣用語
釋義
立刻；同時
without waiting, or with several things happening together, depending on the sentence.
例句
Please call the clinic at once if the baby's fever rises.
The cousins all laughed at once when Leo slipped on the mat.