问题描述:
最好有图片
问题解答:
http://images.google.cn/images?q=%E9%95%87%E5%AE%89%E7%BB%A3%E5%B1%8F%E5%85%AC%E5%9B%AD&client=aff-9991&ie=UTF-8&oe=utf8&hl=zh-CN&channel=searchbutton&um=1&sa=N&tab=wi