详细讨论了当向心力突然增大后，原来作匀速圆周运动的小球其运动轨迹的变化情况，证明了小球将作螺线运动。

A small ball is making circular motion at the uniform velocity, the centripetal force has suddenly increased, it is proved that the small ball will generally make a spiral motion.

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从1980年代起，区域己经经受快捷解除工业化，当钢厂关闭和把运动嵌入一经济衰退的向下螺线结果是一系列的社会的问题时。

Since the 1980s, the area has undergone rapid deindustrialization as the steel mills closed and set in motion a downward spiral of economic decline resulting in a series of social problems .

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