Some harms caused by the back roller cracking are pointed out and also some measures are given.

进而分析了后罗拉头断裂造成质量事故的危害性，提出了防范措施。

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The outer surface of back roller is the elastic material and the back roller is installed with one foil strip.

背辊外表面为弹性材料，背辊上装有一条箔带。

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By controlling the speed of front roller and back roller, the software controls the pulling times and twisting degree.

通过控制前罗拉与后罗拉的转速，由软件实现对粗纱牵伸倍数与捻度的控制。

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Will it bounce back or will it be another downdraft on the roller coaster?

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And from the top of the roller coaster, it's a long, scary ride back to Earth.

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Dowell Myers, a professor of urban planning and demography at the University of Southern California, said the state's growth has been a "roller coaster, " but he doesn't expect the ride to go back up in the future.

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