Per message delivery semantics: These semantics allow for each message to be delivered differently as well as use a different guarantee level per message.
每消息传递语义：这些语义允许被传递的每个消息都是不同的，而且每个消息使用不同的保证级别。
2
If you can guarantee on-time delivery with a penalty for late delivery, we can accept your sales price.
如果你能保证用惩罚延误发货方式准时发货，你的销售价我们可以接受。
3
We regret the need for you to write to us and guarantee the safe delivery of your orders in future.