tooltips

例句:

• ToolTips provide textual hints that assist in drawing lines and aligning objects.
  工具提示提供了协助画线和对象对齐的文本提示.
  来自About Face 3交互设计精髓
• Design Principle Use ToolTips with all toolbar and iconic controls.
  所有的工具栏和图标控件都应该使用工具提示.
  
• ToolTips are modeless online help, and they are incredibly effective.
  工具提示是非模态的在线帮助, 其效果好得不可思议.
  
• Tooltips would still be presented to the user, which may be unwanted and potentially confusing.
  来自BBC