A common concern about base station and local wireless network antennas relates to the possible long-term health effects that whole-body exposure to the RF signals may have.
基台和无线局域网络天线方面通常令人关注的一个问题涉及整个人体接触射频信号可造成的长期健康影响。
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China plans to launch a space laboratory before 2016, and hopes to have a space station in orbit capable of accommodating long-term stays in space by around 2020, officials have said.
Why: Described as "the longest rammed earth wall in Australia," the 750-foot long structure was built to provide short-term accommodations for a cattle station during mustering season.