西维吉尼亚州(准确的说是查尔斯顿西南地区)的农村地区居民如果在2009年12月的某个寒冷的早晨仰望天空的话将有幸看到一柱晕光冲破稀薄的云层在头顶盘旋。
Looking up on a chilly December morning in 2009, residents of rural west Virginia (southwest of Charleston) would have seen a halo of light bursting through the thin bank of clouds that hung overhead.
专家预测到本世纪末，营救工具能够盘旋在被困人的上方，直接通过空气柱把他们搭救到营救工具上。
Experts predict that by the end of the century, rescue vehicles will be able to hover above people in trouble and lift them directly into the rescue vehicle through a column of air!
主机电动机通过减速器带动主轴及各层转盘旋转，转盘通过柱销带动几十个环辊在磨环滚道内滚动并旋转。
The main bearing and each dial are driven by electromotor of main machine through reducer, and Numbers of roller which are rolling in the ring, which are driven by dial through plunger.
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