如果间隔太长，事件通知可能晚于客户端的期望时间到达。
If the interval is too long, the event notifications may arrive later than the client desires.
本文结合应急物流的特征，研究了应急需求稀少和应急需求密集两种情况下的系统期望时间。
Combined with characteristics of emergency logistics, mean system times under sparse requests and heavy requests are analyzed in the paper.
很多大银行和大金融机构发生灾难的原因就是他们的交易者没有受到严格监管，亏了钱就想做长线，期望时间会拯救他们。
Disasters at Banks and major financial firms occur when poorly supervised traders lose money in short-term trades and stick them into long-term accounts, hoping that time will bail them out.
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