而人们却担心这么突出的指数反弹会导致问题累积。
But there are fears that the impressive V-shaped rebound may be storing up trouble.
此模式还能为累积数据进行夜间处理的需求提供支持，这可能包括货品计价、帐单编制、合同问题和相关文档及更新通知。
This pattern also supports the need to accumulate data for overnight runs which might cover invoicing, billing, issue of contracts and related documents and renewal reminders.
SACK 要解决的问题普通累积式应答的 “全有或全无” 性质。
The problem SACK is meant to address is this "all or nothing" nature of the plain cumulative acknowledgment.
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