NASA spokesman Steve Cole said that was possible because the last track for the satellite included Canada, starting north of Seattle and then in a large arc north then south.
NASA发言人史蒂夫.科尔说，因为加拿大留下了卫星的最后轨迹，所以存在这样一种可能，就是从西雅图北部开始，然后以大弧形向北再向南。
From starting-up to stabilization of the arc, the electric current and voltage usually fluctuate acutely, which makes a great impact on other circuit components.
由电孤启动到正常工作这段时间，电网线路的电流电压波动性较大，往往给电路其它各元件造成强烈的冲击。
An ellipse is defined by its bounding rectangle; an arc is a portion of an ellipse defined by a starting Angle and a sweep Angle.
椭圆是由其边框定义的；弧是椭圆的一部分，由一个起始角和一个扫描角定义。
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