As polyethylene wear secondary to a high activity level could be problematic, hard-on-hard bearings have been proposed to reduce wear.

面对仅次于高活动水平问题的聚乙烯磨损问题，硬质对硬质材料的人工关节被认为可以降低磨损。

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Another is negative one easily inducing bad cultural model of mother such as high intensity of reaction, high activity level, low adaptability and so on.

容易引发母亲不良的教养方式的消极气质因素，如高反应强度、高活动性、低适应性等。

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Although the origins are uncertain, experts think that this is largely due to the high level of volcanic activity in the area.

尽管起源还不确定，专家认为这主要是由该地区频繁的火山喷发所造成的。

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Plastiki also is supplied with a nutritional guide for the crew advising them on what to eat and how to build meals that support the periods of high-level activity during the voyage.

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"A lot of these patients have been involved with a fairly high level of activity for a long time, " Stubbs said.

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This is particularly the case with a security that does not have a high level of trading activity on a given day.

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