ScienceDaily (Dec. 20, 2010) —Study suggests that trace amounts of water created oceans on Earth and other terrestrial planets, including those outside the solar system.
《每日科学杂志》(2010年12月20日)——研究表明微量的水创造了地球和其他类地行星上的海洋,包括那些在太阳系以外的类地行星。
Objective: to study relation between children with recurrent respiratory trace infection and zine, selenium in serum.
目的：了解反复呼吸道感染与血清中微量元素锌、硒含量的关系。
It is crucial to study the features of the frequency hopping signals in both time and frequency domain in order to detect and trace the FH signals.
对跳频信号的时频域进行分析是研究跳频通信，实现识别、跟踪跳频信号的重要基础。
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