研究人员在七至九个月时间里，每天两次，每次一小时，让这些正常的和患老年痴呆症的啮齿动物接触由标准手机产生的电磁场。
Both the normal rodents and those with Alzheimer's were exposed to the electromagnetic field generated by standard mobiles use for two one-hour periods each day for seven to nine months.
《电机和电子工程师学会人体接触射频电磁场安全水平标准：3千赫至300千兆赫》，IEEE Std C95.1, 2005年。
IEEE standard for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz, IEEE Std C95.1, 2005.
目光的接触是衡量两个谈话人之间关系亲密程度的一个标准，尽管在不同的民族文化中对目光接触的意义有所不同。
Eye contact is one way of measuring the degree of closeness of relationship between two speakers, although there are cultural variations in the meaning of eye contact.
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