Increasingly, researchers have begun to look at the quality of relationships, rather than at the frequency of contact, between the elderly and their children.

越来越多的研究人员开始关注老人和孩子之间关系的质量，而不是他们之间联系的频率。

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The frequency of contact may suggest either interest or boredom.

眼神接触的频率可以解读出是否感兴趣。

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Results: The main risk factors are dust and noise which frequency of contact by workers is high.

结果：主要危害因素为粉尘、噪音，职工接害频率高。

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What is new is the frequency of people's contact with them and how easily they can now be spread around the world.

CNN: Tracking deadly viruses' spread from animals to humans

They acknowledge the difficulties caused by choosing radio-frequency chips instead of a system where direct contact must be made with the reader.

ECONOMIST: High-tech passports are not working