The invention has the advantages of simplicity of structure, low error rate, high reliability, no limitation of width of banding moving object, wide application area and so on.

具有结构简单、故障率低、可靠性高；对带状运动物宽度无限制以及应用范围广等优点。

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"While a 150, 000-170, 000 per month trend in payrolls is far from booming, it is strong enough over time to keep the unemployment rate moving down, " said Jim O'Sullivan at High Frequency Economics.

BBC: US unemployment rate holds steady in December at 7.8%