动词短语
中文翻译：钢铁球滚动
同义词：
['roll steel ball', 'roll a steel ball']
例句：
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1.The steel ball rolling down the hill is a sight to behold.
钢球滚下山坡的景象令人叹为观止。
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2. The engineer was so excited that he could hardly contain himself while rolling the steel ball.
工程师兴奋得几乎控制不住自己，在滚动钢球时。
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3. The steel ball rolling on the tracks is the only noise in this silent factory.
钢球在轨道上滚动，是这个寂静工厂里的唯一声音。