The Org designs for scheduled to be the date to start working on the task and deadline to be the date to stop. Only one scheduled and one deadline is allowed per task. The task will appear in agenda since scheduled and/or from a few weeks before the deadline and until it is marked done.
However, you can put multiple active timestamps <…> - the task will appear in agenda on the matching dates. This is useful for appointments. (Note that on your screenshot, Org mode does not recognize the second pair of scheduled/deadline as such - they are considered timestamps)
See Deadlines and Scheduling (The Org Manual)
If you absolutely need several scheduled/deadline for one task, you can create multiple tasks with org-clone-subtree-with-time-shift command.
安排的组织设计是开始执行任务的日期和截止日期，以成为停止日期。 每个任务只允许一个计划和一个截止日期。 该任务将出现在预定和/或从截止日期之前的几周开始，直到标记完成为止。
但是，您可以放置多个活动时间戳<…> - 该任务将在匹配日期的议程中出现。 这对于约会很有用。 （请注意，在您的屏幕截图上，组织模式无法识别第二对计划/截止日期 - 它们被视为时间戳）
请参阅https://orgmode.org/manual/deadlines-and-scheduling.html
如果您绝对需要几个计划/截止日期，则可以使用org-clone-subtree-with-with-shift命令创建多个任务。