它使用一个调度程序来发起周期性的事件，比如爬网程序执行和全文索引维护。
It USES a scheduler to initiate periodic events, such as crawler executions and full-text index maintenance.
现实但不要忘记诸如汽车维护和礼物等周期性的费用。
Be realistic and don't forget periodic expenses like vehicle maintenance and gifts.
讨论了系统的路由表维护，对周期性路由表维护和非周期性路由表维护各自的优缺点进行了比较；
Then the thesis discusses maintaining routing-table, and compares virtue and defect of maintaining periodic routing-table and aperiodic routing-table.
维护版周期性的纳入现存组件来发行。
Maintenance builds are produced periodically to incorporate fixes into an existing release.
周期性的紧急维护阶段是恢复服务器的稳定性，同时我们可以缩小问题产生原因的范围。
The emergency maintenance periods are to restore stability while we continue to narrow down the cause of the problems.
实践证明这种开发方法具有开发周期性短、可维护性强等特点。
It has been proved in practice that this development has many advantages, such as short development cycle and strong fine maintainability.
周期性设备保养维护和非计划设备维护保养，设备调试，故障解决。
Regular equipment Preventive maintenance and unplanned equipment maintenance, tools debug & troubleshooting.
周期性设备保养维护和非计划设备维护保养，设备调试，故障解决。
Regular equipment Preventive maintenance and unplanned equipment maintenance, tools debug & troubleshooting.
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