一个有趣的新元素是喷泉和抛光大理石雕刻的滚动球的水，从下面的气泡膜。
One interesting new fountain element is a carved and polished marble ball that rolls on a film of water, which bubbles from beneath.
许多设备提供不同类型的用户输入机制，例如键盘，滚动球，或五方向的导航键。
Many devices provide a different type of user input mechanism, such as a hardware keyboard, a trackball, or a five-way navigation pad.
叙述了滚动球窝喷管在设计中许用接触应力的选择依据及方法，并根据以往的经验公式及其试验数据对影响许用接触应力的几个因素进行了分析。
Selection basis and method on allowable contact stress of rolling ball-socket nozzle were described. Based on empirical formula and test data, several factors affecting allowable stress were analyzed.
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