按有关规定及标准对所有计量仪器作周期检查和校准，完成并保存相关计量仪器校验记录和计量鉴定证书；
According to the relevant regulations and standards to inspect and calibrate all measuring instrument, complete and save the relevant calibration record and appraisal certificate;
还有一个 secondary namenode，它不是 namenode 的冗余守护进程，而是提供周期检查点和清理任务。
There's also a secondary namenode, which isn't a redundant daemon for the namenode but instead provides period checkpointing and housekeeping tasks.
进行周期性检查以确保高标准得以维持。
Periodic checks are taken to ensure that high standards are maintained.
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