So we’ll complicate things just a touch and create a button on the page, for which we’ll write an event handler to pop up a message box saying "Hello world", instead.
为了演示这一面，我们来做一个稍稍复杂一点的例子 ：在页面上创建一个按钮，然后用一个事件处理器来响应按钮事件并弹出一个消息框显示“Hello world”字样。
The car picks up speed with just a touch of the accelerator.
这辆车只要你一触加速器就会加速。
The hue may be mixed with just a touch of white or with so much white that the hue is very faint.
纯色可以只混入一丁点儿白色，也可以被大量白色冲淡得几乎看不出来。
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