hard upon its heels 紧随其后
hard upon the event 紧接事件之后
hard upon arrival 一到就
hard upon completion 完成后立即
hard upon discovery 发现后马上
1. Hard upon his arrival, the meeting began.
他刚到，会议就开始了。
2. Hard upon the announcement, people started to react.
消息刚发布，人们就开始反应。
3. Hard upon finishing the exam, she left the room.
她一考完试就离开了教室。
4. Hard upon the news, the team changed its plan.
消息一出，团队就改变了计划。
A: Hard upon the bell ringing, students rushed out.
A：铃声一响，学生们就冲了出去。
B: Yes, hard upon that moment, the hallway was full of noise.
B：是的，就在那一刻之后，走廊里充满了喧闹声。
1) 表示时间上紧接着发生
2) 用于强调两个事件间隔极短
3) 常见于书面表达或叙述中
1. 紧接着；随后立即发生
e.g. Hard upon his speech, applause broke out.
演讲刚结束，掌声就响了起来。
noun
1. A phrase meaning immediately after something happens or very soon following an event.
Synonym: shortly after, soon after, immediately after