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给用户一个信息反馈，告诉他们任务执行成功或者失败 让按钮和控件易于被感知 在现实生活中，按钮和各种开关都被设计成易于互动、易于感知的样子，这样的设计让人们更容易控制，也能让事情向着预期的方向发展。百万级商家如
带着十万伏特的好奇心和风险投资从业者的观察力，我们义无反顾地走进了不可思议的印度。这件事情当时在公司被传为佳话，并且直到现在，那家公司还将杨宁的这套工具稍作改良推广到了全国。 杨宁就没这么幸运了，他第二次踏进了同一条“河流”。”
