例如，一个多接口和大体积的服务的测试与一个处理周期性大消息量请求的服务的测试是不同的。
For instance, the test of a multiple-interface and high volume service will be different than a service that handles periodic requests with huge message sizes.
大量控制系统要求周期性采样与处理。
Many control systems require periodic sampling and processing.
在处理日常事务过程中，顺利的双边合作关系和周期性的合作危机掩盖了美日联盟内在的混乱。
On a day-to-day basis, successful bilateral cooperation on both ongoing issues and the periodic crisis of the day belies the notion of an alliance in disarray.
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