至迟

例句：

1. 1. I will finish my work by noon, so you can come in by the earliest train.
   我将在中午前完成工作，所以你最早一班火车来。
2. 2. The meeting is scheduled for tomorrow at 3 pm, so please arrive by 2:30pm.
   会议定于明天下午3点举行，所以请最迟在下午2:30到达。
3. 3. We should finish this task by next Monday, otherwise we'll be behind schedule.
   我们应在下周一之前完成这项任务，否则我们将延误进度。