However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks.
然而，当在实验室的恒定条件下观察硅藻时，它们仍然表现出周期性的行为，继续按计划挖掘几个星期。
2
If no page cleaners are configured, your applications may encounter periodic "log full" conditions.
如果没有配置页清除程序，则应用程序可能会遇到不时发生的“日志已满”情况。
3
However, this approach cannot be used for analysis of load characteristics because it proves impossible to specify periodic boundary conditions.