TrayIcon fires an ActionEvent on a single left mouse click and displays the pop-up menu on a single right mouse click.
TrayIcon在鼠标左键单击时将触发actionevent，而在鼠标右击时则显示弹出菜单。
The user would not simply click a single button, but would have to select the right button for each question.
这样用户不可以只是简单点一下鼠标，而是不得不去选正确的选项给每一个问题。
A single click can take you right across the world!
一个单一的点击能令您穿越世界！
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