One afternoon, the home-made ball was spinning across the grass when it was suddenly stopped by someone.
一天下午,这个自制足球正在草地上滚动着,突然被人拦住了。
The basic principle with respect to ball spinning is introduced, and based on plastic mechanics, the influence of mechanical parameters on formability of spun parts is analyzed.
介绍了滚珠旋压的基本原理,以塑性力学为基础,分析力学参数对旋压件成形性的影响。
I could see the ball spinning as it came towards me.
当那球飞来时我可以看到球在旋转。
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