Last year was a record year for ice melt all over the Arctic and the ice band surrounding the North Pole is even thinner now.

去年是北极地区冰层融化创记录的一年，如今北极周围的冰带更薄了。

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Mathematical model of wide-band oscilloscope system is established. The analysis is based on the concept of the leading pole. An approximate expression of oscilloscope system is given.

文中首先建立宽带示波器系统的数学模型，然后应用主导极点的概念进行分析，最后给出关于示波器系统冲最的近以表达式。

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To safely simulate a pull-up, the Thera-Band is first wrapped around a pole or bed post.

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