For example, to query incoming related elements, place the mouse on the element and double click on the box of the incoming arrow that pops up.
例如，要查询引入的相关元素，将鼠标放在元素上，双击这个弹出的引入箭头的方框。
2
Imagine a Web form that responds to you not just when you click a button, but when you type into a field, when you select an option from a combo box... even when you drag your mouse around the screen.
If you're an iMac user using bluetooth peripherals do be aware that these will not work out of the box in Ubuntu, so have a wired keyboard and mouse to hand.