东非和西非农民只需在手机上按下一键钮，就可查看几十种作物的价格。
Farmers in both East and West Africa can click a button on their cell phone to check prices on dozens of crops.
遇到麻烦时，飞行员一按键钮就可以开始下传数据，在某些情况下，比如自动驾驶系统出故障时，飞机会自动开启数据流传输。
In case of trouble, a pilot pushes a button to begin sending down data, and in some conditions, like the failure of autopilot, the data streams automatically.
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