The Geological Survey of Canada, which conducts out periodic surveys to monitor magnetic north, says it is slowly drifting across the Canadian Arctic.

加拿大为了监测磁北而进行的周期性的地理调查显示磁极正在缓慢的漂过加拿大的北极圈。

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Methods: Through telephone follow-up survey, periodic reexamination and readmission, continuously nursing interference was applied to the patients with NPC so that compliance can be understand.

方法：对NPC患者住院时及出院半年后进行护理干预，通过电话随访、定期复查等方式了解患者依从性的状况。

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There have been periodic flare-ups over the islands before, usually involving attempts by nationalists to land on them or, in December 2008, a close approach by Chinese survey vessels.

此前，定期都有船只在岛屿附近突现，通常是名族主义者试图登岸。2008年，就有中国勘探船近距离接近该岛。

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There have been periodic flare-ups over the islands before, usually involving attempts by nationalists to land on them or, in December 2008, a close approach by Chinese survey vessels.

此前，定期都有船只在岛屿附近突现，通常是名族主义者试图登岸。2008年，就有中国勘探船近距离接近该岛。

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